Answer:
Step-by-step explanation:
Hello!
Missing Questions:
1) The probabylity of P(121 < X ≤ 129) is:
You can rewrite it as:
P(X ≤ 129) - P(X < 121)
Now the expression " P(X < 121)" does not include 121 so to calculate this interval you have to substract the cummulative probability to the previoous value of the variable " P(X ≤ 120)"
Then the interval is
P(X ≤ 129) - P(X ≤ 120)= 0.978 - 0.533= 0.445
2) The approximation to normal (without correction of continuity) of P(121 < X ≤ 129) is:
To use the normal approximation you have to calculate the mean and variance of the variable.
E(X)= np= 150*0.8= 120
V(X)= np(1-p)= 150*0.8*0.2= 24
Now you can standardize the given interval:
P(X ≤ 129) - P(X < 121)= P(Z ≤ (129-120)/√24) - P(Z < (121-120)/√24)
P(Z ≤ 1.84) - P(Z < 0.20) = 0.967 - 0.579= 0.388
3) The approximation to normal (with correction of continuity) of P(121 < X ≤ 129) is:
P(121 < X ≤ 129)
Applying the correction of continuity:
For X ≤ n + 0.5
For X > n + 0.5
P(121.5 < X ≤ 129.5) = P(X ≤ 129.5) - P(X < 121.5)
P(Z ≤ (129.5-120)/√24) - P(Z < (121.5-120)/√24)
P(Z ≤ 1.94) - P(Z < 0.31) = 0.974 - 0.622= 0.352
4) The approximation of poisson of P(121 < X ≤ 129) is:
First define the rate of successes of the distribution λ= np= 150*0.8= 120
Then you look at the individual cummulative probabilities using the tables of the distribution:
P(X ≤ 129; λ= 120)= 0.808
P(X < 121; λ= 120)= P(X ≤ 120; λ= 120)= 0.524
P(121 < X ≤ 129) = P(120 ≤ X ≤ 129)= P(X ≤ 129) - ≤ 129)= 0.808 - 0.524= 0.284
I hope it helps!
A government watchdog association claims that 70% of people in the U.S. agree that the government is inefficient and wasteful. You work for a government agency and asked to test this claim to determine if the true proportion differs from 70%. You find that in a random sample of 1165 people in the U.S., 746 agreed with this view. Test the claim at 0.02 level of significance and determine which one of the following is a correct conclusion?
A.There is not sufficient evidence that the true population proportion is not equal to 70%.
B.There is sufficient evidence that the true population proportion is greater than 70%.
C.There is sufficient evidence that the true population proportion is less than 70%.
D.There is sufficient evidence that the true population proportion is not equal to 70%.
Answer:
Option D) There is sufficient evidence that the true population proportion is not equal to 70%.
Step-by-step explanation:
We are given the following in the question:
Sample size, n = 1165
p = 70% = 0.7
Alpha, α = 0.02
Number of people who agreed , x = 746
First, we design the null and the alternate hypothesis
[tex]H_{0}: p = 0.7\\H_A: p \neq 0.7[/tex]
This is a two-tailed test.
Formula:
[tex]\hat{p} = \dfrac{x}{n} = \dfrac{746}{1165} = 0.64[/tex]
[tex]z = \dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}[/tex]
Putting the values, we get,
[tex]z = \displaystyle\frac{0.64-0.7}{\sqrt{\frac{0.7(1-0.7)}{1165}}} = -4.46[/tex]
Now, [tex]z_{critical} \text{ at 0.02 level of significance } = \pm 2.33[/tex]
Since,
Since, the calculated z statistic does not lie in the acceptance region, we fail to accept the null hypothesis and reject it. We accept the alternate hypothesis.
Thus, there is enough evidence to support the claim that the true proportion differs from 70%.
Option D) There is sufficient evidence that the true population proportion is not equal to 70%.
According to one cosmological theory, there were equal amounts of the two uranium isotopes 235U and 238U at the creation of the universe in the "big bang." At present there are 137.7 atoms of 238U for each atom of 235U. Using the half-lives 4.51×109 years for 238U and 7.10×108 years for 235U, calculate the age of the universe.
Answer:
6 billion years.
Step-by-step explanation:
According to the decay law, the amount of the radioactive substance that decays is proportional to each instant to the amount of substance present. Let [tex]P(t)[/tex] be the amount of [tex]^{235}U[/tex] and [tex]Q(t)[/tex] be the amount of [tex]^{238}U[/tex] after [tex]t[/tex] years.
Then, we obtain two differential equations
[tex]\frac{dP}{dt} = -k_1P \quad \frac{dQ}{dt} = -k_2Q[/tex]
where [tex]k_1[/tex] and [tex]k_2[/tex] are proportionality constants and the minus signs denotes decay.
Rearranging terms in the equations gives
[tex]\frac{dP}{P} = -k_1dt \quad \frac{dQ}{Q} = -k_2dt[/tex]
Now, the variables are separated, [tex]P[/tex] and [tex]Q[/tex] appear only on the left, and [tex]t[/tex] appears only on the right, so that we can integrate both sides.
[tex]\int \frac{dP}{P} = -k_1 \int dt \quad \int \frac{dQ}{Q} = -k_2\int dt[/tex]
which yields
[tex]\ln |P| = -k_1t + c_1 \quad \ln |Q| = -k_2t + c_2[/tex],
where [tex]c_1[/tex] and [tex]c_2[/tex] are constants of integration.
By taking exponents, we obtain
[tex]e^{\ln |P|} = e^{-k_1t + c_1} \quad e^{\ln |Q|} = e^{-k_12t + c_2}[/tex]
Hence,
[tex]P = C_1e^{-k_1t} \quad Q = C_2e^{-k_2t}[/tex],
where [tex]C_1 := \pm e^{c_1}[/tex] and [tex]C_2 := \pm e^{c_2}[/tex].
Since the amounts of the uranium isotopes were the same initially, we obtain the initial condition
[tex]P(0) = Q(0) = C[/tex]
Substituting 0 for [tex]P[/tex] in the general solution gives
[tex]C = P(0) = C_1 e^0 \implies C= C_1[/tex]
Similarly, we obtain [tex]C = C_2[/tex] and
[tex]P = Ce^{-k_1t} \quad Q = Ce^{-k_2t}[/tex]
The relation between the decay constant [tex]k[/tex] and the half-life is given by
[tex]\tau = \frac{\ln 2}{k}[/tex]
We can use this fact to determine the numeric values of the decay constants [tex]k_1[/tex] and [tex]k_2[/tex]. Thus,
[tex]4.51 \times 10^9 = \frac{\ln 2}{k_1} \implies k_1 = \frac{\ln 2}{4.51 \times 10^9}[/tex]
and
[tex]7.10 \times 10^8 = \frac{\ln 2}{k_2} \implies k_2 = \frac{\ln 2}{7.10 \times 10^8}[/tex]
Therefore,
[tex]P = Ce^{-\frac{\ln 2}{4.51 \times 10^9}t} \quad Q = Ce^{-k_2 = \frac{\ln 2}{7.10 \times 10^8}t}[/tex]
We have that
[tex]\frac{P(t)}{Q(t)} = 137.7[/tex]
Hence,
[tex]\frac{Ce^{-\frac{\ln 2}{4.51 \times 10^9}t} }{Ce^{-k_2 = \frac{\ln 2}{7.10 \times 10^8}t}} = 137.7[/tex]
Solving for [tex]t[/tex] yields [tex]t \approx 6 \times 10^9[/tex], which means that the age of the universe is about 6 billion years.
The age of the universe, based on the given ratio of 238U to 235U isotopes and their half-lives, is approximately 8750 years.
To calculate the age of the universe based on the ratio of 238U to 235U isotopes, we can use the concept of radioactive decay and the given half-lives.
The ratio of 238U to 235U is currently 137.7 to 1. This means that over time, 238U has been decaying into other elements, while 235U has been decaying into different elements at different rates due to their distinct half-lives.
We'll start by calculating the number of half-lives that have passed for each isotope to reach the current ratio:
For 238U:
(Number of half-lives) = (Age of the universe) / (Half-life of 238U)
(Number of half-lives) = (Age of the universe) / (4.51 × [tex]10^9[/tex] years)
For 235U:
(Number of half-lives) = (Age of the universe) / (Half-life of 235U)
(Number of half-lives) = (Age of the universe) / (7.10 × [tex]10^8[/tex] years)
Since there is a ratio of 137.7 to 1, it means that the number of half-lives for 238U should be 137.7 times that of 235U:
(Number of half-lives for 238U) = 137.7 × (Number of half-lives for 235U)
Now, we can set up an equation using these relationships:
(137.7) × [(Age of the universe) / (4.51 × [tex]10^9[/tex] years)] = (Age of the universe) / (7.10 × 1[tex]0^8[/tex]years)
Now, we can solve for the "Age of the universe":
137.7 × (4.51 × [tex]10^9[/tex]) = 7.10 × [tex]10^8[/tex] × (Age of the universe)
(Age of the universe) = (137.7 × 4.51 × [tex]10^9[/tex]) / (7.10 × [tex]10^8[/tex])
(Age of the universe) ≈ 8750 years
So, according to this cosmological theory, the age of the universe is approximately 8750 years.
For more such questions on ratio
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Suppose a biologist studying the mechanical limitations of growth among different species of tulips monitors a national preserve. He collects data on the heights of 10 different types of tulips in the reserve and rounds each height to the nearest centimeter.
25,21,26,24,29,33,29,25,19,24
Compute the first quartile (Q1), the third quartile (Q3), and the interquartile range (IQR) of the data set.
Answer:
[tex] Q_1 = 24[/tex]
[tex]Q_3 = 29[/tex]
[tex] IQR= Q_3 -Q_1 = 29-24 =5[/tex]
Step-by-step explanation:
For this case we have the following dataset:
25,21,26,24,29,33,29,25,19,24
The first step is order the data on increasing order and we got:
19, 21, 24, 24, 25, 25, 26, 29, 29 , 33
For this case we have n=10 an even number of data values.
We can find the median on this case is the average between the 5 and 6 position from the data ordered:
[tex] Median = \frac{25+25}{2}=25[/tex]
In order to find the first quartile we know that the lower half of the data is: {19, 21, 24, 24, 25}, and if we find the middle point for this interval we got 24 so this value would be the first quartile [tex] Q_1 = 24[/tex]
For the upper half of the data we have {25,26,29,29,33} and the middle value for this case is 29 and that represent the third quartile [tex]Q_3 = 29[/tex]
And finally since we have the quartiles we can find the interquartile rang with the following formula:
[tex] IQR= Q_3 -Q_1 = 29-24 =5[/tex]
In the context of regression analysis, what is the definition of an influential point?
a. Observed data points that are close to the other observed data points in the horizontal direction
b. Observed data points that are far from the least squares line
c. Observed data points that are far from the other observed data points in the horizontal direction
d. Observed data points that are close to the least squares line
Answer:
c. Observed data points that are far from the other observed data points in the horizontal direction
True, by definition are observed data points that are far from the other observed data points in the horizontal direction.
Step-by-step explanation:
When we conduct a regression we consider influential points by definition "an outlier that greatly affects the slope of the regression line". Based on this case we can analyze one by one the possible options:
a. Observed data points that are close to the other observed data points in the horizontal direction
False. If are close to the other observed values then are not influential points
b. Observed data points that are far from the least squares line
False, that's the definition of outlier.
c. Observed data points that are far from the other observed data points in the horizontal direction
True, by definition are observed data points that are far from the other observed data points in the horizontal direction.
d. Observed data points that are close to the least squares line
False. If are close to the fit regression line adjusted then not affect the general equation for the model and can't be considered as influential points
5 small size companies, 9 median and 41 large ones are randomly selected for a financial auditing from 31 small. 59 median and 43 large companies. Identify which sampling technique is used Stratified Convenience Random Cluster Systematic
Answer:
Stratified
Step-by-step explanation:
Stratified sampling is a type of sampling method in which the observer divides the overall population into different groups.
These groups are known as strata.
Within the each group, a probability sample is selected.
stratified sampling helps in reducing the sample size required to attain a required precision.
Determine whether the underlined numerical value is a parameter or a statistic. Explain your reasoning. Upper A poll of all 2000 students in a high school found that Modifying 94 % with underline of its students owned cell phones.
Answer:
The numerical value is a parameter.
Step-by-step explanation:
We are given the following situation in the question:
A poll of all 2000 students in a high school found that Modifying 94 % with underline of its students owned cell phones.
Individual of interest:
Students in a high school found
Variable of interest:
Percentage of students owned a cell phone
Population of interest:
All 2000 high school students.
94 % with underline of its students owned cell phones.
Since this numerical value describes all of the 2000 high school student, it is describing the population of interest. Thus, the numerical value is a parameter.
Which equation is equivalent to (one-third) Superscript x Baseline = 27 Superscript x + 2? 3 Superscript x Baseline = 3 Superscript negative 3 x + 2 3 Superscript x Baseline = 3 Superscript 3 x + 6 3 Superscript negative x Baseline = 3 Superscript 3 x + 2 3 Superscript negative x Baseline = 3 Superscript 3 x + 6
Answer:
Option D : 3 Superscript negative x Baseline = 3 Superscript 3 x + 6
Step-by-step explanation:
Let us first convert all the equations in Mathematical form for readability.
The question equation will become:
[tex](\frac{1}{3})^{x}=(27)^{x+2}[/tex] ----------------- (1)
And the option equations will be:
A. [tex]3^{x}=3^{(-3x+2)}[/tex]
B. [tex]3^{x}=3^{(3x+6)}[/tex]
C. [tex]3^{-x}=3^{(3x+2)}[/tex]
D. [tex]3^{-x}=3^{(3x+6)}[/tex]
Now, let's solve the question equation. Simplifying equation (1), we get
[tex](3^{-1})^{x} = (3^3)^{x+2}\\\\3^{-x} = 3^{3(x+2)}\\\\3^{-x} = 3^{(3x+6)}[/tex]
Hence, option D is correct.
Answer:
D
Step-by-step explanation:
Determine what type of observational study is described. Explain. Researchers wanted to determine whether there was an association between high blood pressure and the suppression of emotions. The researchers looked at 1800 adults enrolled in a health initiative observational study. Each person was interviewed and asked about their response to emotions. In particular they were asked whether their current tendency was to express or to hold in anger and other emotions. The degree of suppression of emotions was rated on a scale of 1 to 10. Each person's blood pressure was also measured. The researchers analyzed the results to determine whether there was an association between high blood pressure and the suppression of emotions. A. The observational study is a retrospective study because individuals are asked to look back in time. B. The observational study is a cross-sectional study because information is collected at a specific point in time. C. The observational study is a cohort study because individuals are observed over a long period of time.
Final answer:
The described observational study is a cross-sectional study, as it involves collecting data once at a particular point in time, without any follow-up observations. So the correct option is B.
Explanation:
The type of observational study described in the scenario is a cross-sectional study. This classification is based on the researchers collecting data at a specific point in time by interviewing a sample of 1800 adults about their tendencies in handling emotions and measuring their blood pressure. Since the data on suppression of emotions and blood pressure is gathered just once from these individuals, without any follow-up at later dates, this defines the hallmark of a cross-sectional study. In contrast, a retrospective study would involve looking back at past behaviors or conditions, and a cohort study would imply following a group of individuals over a prolonged period of time to observe outcomes, neither of which applies to this particular research setup.
Final answer:
The study in the question is a cross-sectional study because it gathers data from subjects at a specific point in time to assess the association between emotional suppression and high blood pressure.
Explanation:
The study described in the question can be classified as a cross-sectional study because it involved collecting data from the individuals at a specific point in time. Participants in the study were asked about their response to emotions and their current tendency to express or hold in anger and other emotions. Additionally, their blood pressure was measured. This type of observational study is designed to analyze data at a single point in time to find any associations or correlations, such as the one being investigated between emotional suppression and high blood pressure.
A method for assessing age-related changes that combines the cross-sectional and longitudinal approaches by observing a cross section of participants over a relatively limited period of time is called a ____.a. mixed longitudinal studyb. limited longitudinal studyc. longitudinal studyd. cohort study
Answer:
a. mixed longitudinal study
True, by definition a mixed-longitudinal study is when "have defined some cohorts and these are followed for a shorter period and we can compare the precision, bias due to age and cohort effects" on the entire study. So that represent the perfect mix between longitudinal and cross sectional study.
Step-by-step explanation:
a. mixed longitudinal study
True, by definition a mixed-longitudinal study is when "have defined some cohorts and these are followed for a shorter period and we can compare the precision, bias due to age and cohort effects" on the entire study. So that represent the perfect mix between longitudinal and cross sectional study.
b. limited longitudinal study
This definition is not appropiate and is not usually used in the experimental designs.
c. longitudinal study
False, a longitudinal study is a design on which have "repeated observations of the same variables over short or long periods of time" and for this case we need cross sectional conditions, so for this case not applies.
d. cohort study
False, by definition a cohort study is an extesion of the longitudinal design but on this case " the samples are obtained from a cohort using cross-section intervals through time" and for this reason not applies for our case since we need a longitudinal design combined with the cross sectional design
Six different second-year medical students at Bellevue Hospital measured the blood pressure of the same person. The systolic readings (in mmHg) are listed below. Find the range, variance, and standard deviation for the given sample data. If the subject's blood pressure remains constant and the medical students correctly apply the same measurement technique, what should be the value of the standard deviation? 131 137 138 141 141 149131 137 138 141 141 149 Rangeequals=nothing mmHg Sample varianceequals=nothing mmHgsquared2 (Round to the nearest tenth as needed.) Sample standard deviationequals=nothing mmHg (Round to the nearest tenth as needed.) What should be the value of the standard deviation?
A. Ideally, the standard deviation would be one because all the measurements should be the same.
B. Ideally, the standard deviation would be zero because all the measurements should be the same.
C. Ideally, the standard deviation would be one because this is the lowest standard deviation that can be achieved.
D. There is no way to tell what the standard deviation should be.
Answer:
[tex] Range = 149-131=18[/tex]
[tex] s^2 =\frac{(131-139.5)^2 +(137-139.5)^2 +(138-139.5)^2 +(141-139.5)^2 +(141-139.5)^2 +(149-139.5)^2}{6-1}=35.1[/tex][tex] s =\sqrt{35.1}=5.9[/tex]
B. Ideally, the standard deviation would be zero because all the measurements should be the same.
Step-by-step explanation:
For this case we have the following data:
131 137 138 141 141 149
For this case the range is defined as [tex] Range = Max-Min[/tex]
And for our case we have [tex] Range = 149-131=18[/tex]
First we need to calculate the average given by this formula:
[tex] \bar X = \frac{\sum_{i=1}^n X_i}{n}=\frac{837}{6}=139.5[/tex]
We can calculate the sample variance with the following formula:
[tex] s^2 = \frac{\sum_{i=1}^n (X_i -\bar x)^2}{n-1}[/tex]
And if we replace we got:
[tex] s^2 =\frac{(131-139.5)^2 +(137-139.5)^2 +(138-139.5)^2 +(141-139.5)^2 +(141-139.5)^2 +(149-139.5)^2}{6-1}=35.1[/tex]
And the standard deviation is just the square root of the variance so then we got:
[tex] s =\sqrt{35.1}=5.9[/tex]
If the subject's blood pressure remains constant and the medical students correctly apply the same measurement technique, what should be the value of the standard deviation?
For this case the variance and deviation should be 0 since we not evidence change then we not have variation. And for this case the best answer is:
B. Ideally, the standard deviation would be zero because all the measurements should be the same.
Let X and Y be independent binomial random variables having parameters(N,p) and (M,p), respectively. Let Z = X+Y;(a) Argue that Z has a binomial distribution with parameters(N+M,P) bywriting X and Y as appropriate sums of Bernoulli random variables.(b) Validate the result in (a) by evaluating the necessary convolution.
Answer:
See explanation below.
Step-by-step explanation:
Part a
For this case we can use the moment generating function for the bernoulli distribution for n trials, given by:
[tex] p(s)^n = (q+ps)^n =\sum_{r=0}^n (nCr) (ps)^r q^{n-r}[/tex]
Wehre p is the probability of success and [tex] P(s_ = q+ps[/tex]
Using this property we see that;
If we multiply the two generating functions we got:
[tex] p(s)^N = (q+ps)^N =\sum_{r=0}^N (NCr) (ps)^r q^{N-r}[/tex]
[tex] p(s)^M = (q+ps)^M =\sum_{r=0}^M (MCr) (ps)^r q^{M-r}[/tex]
[tex] p(s)^M p(s)^N = \sum_{r=0}^N (NCr) (ps)^r q^{N-r} \sum_{r=0}^M (MCr) (ps)^r q^{M-r}[/tex]
And the mass function would be given by:
[tex]= (N+M C r) p^{r} (1-p)^{N+M-r}[/tex]
So we see that follows a binomial random variable with parameters (N+M, p)
Part b
For this case we are assuming that [tex] X \sim Bin (N,p) , Y\sim Bin (M,p)[/tex] and for this case we can assume that [tex] 0 \leq k \leq N+M[/tex] for the proof.
We are interested on the random variable [tex] Z= X+Y[/tex] since the two random variables are independent we can write the probability mass function for Z like this:
[tex] P(Z = X+Y = k) =\sum_{i=0}^k P(X=i , Y=k-i)[/tex]
[tex] P(Z = X+Y = k) =\sum_{i=0}^k P(X=i) P(Y=k-i)[/tex]
And we can replace the mass function for X and Y
[tex] P(Z = X+Y = k) = \sum_{i=0}^k (NCi) p^i (1-p)^{N-i} \sum_{i=0}^k (M C i-1) p^{k-i} (1-p)^{M-K+i}[/tex]
And we can rewrite this like that:
[tex] P(Z = X+Y = k) = \sum_{i=0}^k (NCi) p^i (1-p)^{N-i} (M C i-1) p^{k-i} (1-p)^{M-K+i}[/tex]
[We can take out the constant p:
[tex] P(Z = X+Y = k) = p^k (1-p)^{N+M-k} \sum_{i=0}^k (NCi)(M C k-i)[/tex]
And using properties of the binomial formula we can write this like that:
[tex] P(Z = X+Y = k) = (N+M Ck) p^k (1-p)^{N+M-k} [/tex]
So then we see that [tex] Z= X+Y \sim Bin(N+M ,p)[/tex]
A data set consists of the values 2, 6, 3, and 1. If we consider this a population (all the values available), the variance isA. 12
B. 14
C. the square root of 3.5
D. the square root of 14
E. none of the above
Answer: E. none of the above
Step-by-step explanation:
The given data values that represents the population:
2, 6, 3, and 1.
Number of values : n=4
Mean of the data values = [tex]\dfrac{\text{Sum of values}}{\text{No. of values}}[/tex]
[tex]\dfrac{2+6+3+1}{4}=\dfrac{12}{4}=3[/tex]
Sum of the squares of the difference between each values and the mean =
[tex](2-3)^2+(6-3)^2+(3-3)^2+(1-3)^2[/tex]
[tex]=-1^2+3^2+0^2+(-2)^2[/tex]
[tex]=1+9+0+4=14[/tex]
Now , Variance = (Sum of the squares of the difference between each values and the mean ) ÷ (n)
= (14) ÷ (4)= 3.5
Hence, the variance is 3.5.
Therefore , the correct answer is "E. none of the above".
Pluto has been hard to measure from Earth because of its atmosphere. In 2007 Young, Young, and Buie measured Pluto as having a diameter of 2322 km. In 2015 the New Horizons probe reached Pluto and measured it up close and we now know the actual diameter is 2372 km. What was the percent error of the 2007 measurement?
Answer:
2.15% was the percent error of the 2007 measurement.
Step-by-step explanation:
To calculate the percentage error, we use the equation:
[tex]\%\text{ error}=\frac{|\text{Experimental value - Theoretical value}|}{\text{Theoretical value}}\times 100[/tex]
We are given:
Experimental value of diameter of Pluto ,2015= 2372 km
Theoretical value of diameter of Pluto, 2007 = 2322 km
Putting values in above equation, we get:
[tex]\%\text{ error}=\frac{|2372 km-2322 km|}{2322 km}\times 100\\\\\%\text{ error}=2.15\%[/tex]
Hence, 2.15% was the percent error of the 2007 measurement.
Final answer:
The percent error of the 2007 measurement of Pluto's diameter is 2.11%.
Explanation:
The percent error can be calculated by using the formula:
Percent Error = [(Measured Value - Actual Value) / Actual Value] × 100%
Given that the measured diameter of Pluto in 2007 was 2322 km and the actual diameter is 2372 km, we can substitute these values into the formula to calculate the percent error.
Percent Error = [(2372 km - 2322 km) / 2372 km] × 100% = 2.11%
How many samples of size 5 are possible when selecting from a set of 10 distinct integers if the sampling is done with replacement?
Answer:
100000 ways
Step-by-step explanation:
Given that there are 10 distinct integers.
5 numbers are drawn with replacement
Prob that each number is drawn will have 10 choices
So each of 5 number can be selected in 10 ways
No of ways to select 5 numbers with replacement
= 10^5
=100000 ways
Match each differential equation to a function which is a solution
FUNCTIONS
A. y = 3x + x^2,
B. y = e^{-3 x},
C. y = \sin(x),
D. y = x^{\,\frac{1}{2}},
E. y = 5 \exp(5 x),
DIFFERENTIAL EQUATIONS
1. y'' + 8 y' + 15 y = 0
2. y'' + y = 0
3. y' = 5 y
4. 2x^2y'' + 3xy' = y
Best Answer
Answer:
1. First equation is option B
2. Second equation is option C
3. Third equation is option E
4. Fourth equation no best option.
explanation:
Check the attachment for solution
Following are the calculation to the differential equation:
For point 1)
[tex]y'' + 8 y' + 15 y = 0\\[/tex]
B
[tex]Y = e^{-3x}[/tex] be the solution of this equation
[tex]Y' = -3 e^{-3x}\\\\ y''= 9 e^{-3x} \\\\\therefore \\\\y'' +8y' + 15 y= 9e^{-3x} + 8(-3e^{-3x})+ 15 e^{-3x} \\\\e^{-3x}( 9-24+15)=0[/tex]
For point 2)
[tex]y'' + y = 0[/tex]
C
[tex]y = \sin x[/tex] be the solution of above equation
[tex]y'= -\cos x \\\\y''= -\sin x = -y \\\\y''+y=0\\\\[/tex]
For point 3)
[tex]y' = 5 y[/tex]
[tex]y'=e^{5x}[/tex] be the solution of equation 3
[tex]y'= 5 e^{5y}= 5y =y'=5y[/tex]
For point 4)
[tex]2x^2 y'' + 3xy' = y[/tex]
Let [tex]y=\sqrt{x}[/tex] be the solution of equation (4)
[tex]y'=\frac{1}{2 \sqrt{x} }\\\\y''=- \frac{1}{2} \times \frac{1}{2} \times {x^{- \frac{3}{2}}} ==- \frac{1}{4} \times {x^{- \frac{3}{2}}} \\\\-2x^2 \times =- \frac{1}{4} {x^{- \frac{3}{2}}}+ 3x \times =- \frac{1}{2 \sqrt{x}}\\\\- \frac{1}{2} {x^{ \frac{1}{2}}}+ \frac{3}{2} x^{\frac{1}{2}} =\sqrt{x} =y\\\\[/tex]
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Find A and B given that the function y=Ax√+Bx√ has a minimum value of 54 at x = 81.
a.)A=486 and B=6
b.)A=243 and B=6
c.)A=486 and B=3
d.)A=243 and B=9
e.)A=243 and B=3
The value of A and B given that the function [tex]y=\frac{A}{\sqrt{x} }+B\sqrt{x}[/tex] has a minimum value of 54 at x = 81 is 243 and 3 respectively
Given the function
[tex]y=\frac{A}{\sqrt{x} }+B\sqrt{x}[/tex]
If y= 54 where x = 81, hence
[tex]54=\frac{A}{\sqrt{81} }+B\sqrt{81}\\54=\frac{A}{9}+9B\\486=A+81B\\ A+81B=486[/tex]
At the minimum point [tex]\frac{dy}{dx} = 0[/tex]
Differentiate the given function:
[tex]y=\frac{A}{\sqrt{x} }+B\sqrt{x}\\y'=\frac{-0.5A}{{x^{3/2}} }+\frac{B}{x^{1/2}} \\\frac{-0.5A}{{x^{3/2}} }+\frac{B}{x^{1/2}}=0[/tex]
Substitute x = 81 to hav:
[tex]\frac{-0.5A}{81^{2/3}} +\frac{B}{81^{1/2}}=0\\\frac{-A}{81} + B=0\\-A+81B=0\\A=81B ......................... 2[/tex]
Substitute equation 2 into 1:
[tex]81B+81B= 486\\162B=486\\B=\frac{486}{162} \\B=3[/tex]
Get the value of A:
[tex]A=81B\\A=81(3)\\A=243[/tex]
Hence the value of A and B given that the function [tex]y=\frac{A}{\sqrt{x} }+B\sqrt{x}[/tex] has a minimum value of 54 at x = 81 is 243 and 3 respectively
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The correct values for A and B, given that the function y=Ax√+Bx√ has a minimum value of 54 at x = 81, would be A=243 and B=6. The sum of both divided by 81 equals 54, as stated in the equation.
Explanation:The function provided in this Mathematics problem is y = Ax√ + Bx√:
We are told that function has a minimum value of 54 at x = 81. So if we insert 81 into x, we would get:
54 = 81A + 81B
Then simplify:
54 = 81(A + B)
To find the value for A and B, we need to know more about the relationship between A and B. Unfortunately, the problem doesn't supply enough information for us to determine exact figures of A and B. But from the options provided, we need A and B that sum up to 54/81. Of the choices provided, only (A = 243, B = 6) will give us that sum, so b.) is the correct choice.
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Solve the following system of equations using Gaussian elimination method. If there are no solutions, type "N" for both xx, yy and zz. If there are infinitely many solutions, type "z" for zz, and expressions in terms of zz for xx and yy.-5x-7y-4z=-66x+2y+3z=-2-1x+2y-7z=0
Answer:
x=-224/229,
y=296/229,
z=118/229
Step-by-step explanation:
-5x-7y-4z=-6
6x+2y+3z=-2
-x+2y-7z=0...........( multiple with (-5) and sum with 1st equation, mult with 6 and sum with 2nd equation)
______________
-x+2y-7z=0
-17y+31z=-6.....(mult with 14)
14y-39z=-2.....(mult with -17) then sum
___________
-x+2y-7z=0
-229z=-118, so here we have z=118/229.
14y-39*(118/229)=-2, from here we have y=296/229
-x+2*(296/229)-7*(118/229)=0, we get that x=-234/229
In the same way you can do this in the matrix form>>
Explain why the following sets of vectors are not basis for the indicated vector spaces. (Solve this problem by inspection.)
(a) u1 = (1, 2), u2 = (0, 3), u3 = (2, 7) for R^2
(b) u1 = (-1, 3, 2), u2 = (6, 1, 1) for R^3
a.This set of vectors are not basis for vector space for two-dimentional space R2 due to high number of vectors (3). It means three vector is two much to span 2-dimentional space.
b.This set of vectors are not basis for vector space for three-dimentional space R3 due to small number of vectors (2). It means two vector can't span three-dimentional space.
Find the general indefinite integral. (Use C for the constant of integration. Remember to use absolute values where appropriate.) integral 9 + Squareroot x + x/x dx x + Squareroot x + 9 log (x) +
Answer:
[tex]9\text{ln}|x|+2\sqrt{x}+x+C[/tex]
Step-by-step explanation:
We have been an integral [tex]\int \frac{9+\sqrt{x}+x}{x}dx[/tex]. We are asked to find the general solution for the given indefinite integral.
We can rewrite our given integral as:
[tex]\int \frac{9}{x}+\frac{\sqrt{x}}{x}+\frac{x}{x}dx[/tex]
[tex]\int \frac{9}{x}+\frac{1}{\sqrt{x}}+1dx[/tex]
Now, we will apply the sum rule of integrals as:
[tex]\int \frac{9}{x}dx+\int \frac{1}{\sqrt{x}}dx+\int 1dx[/tex]
[tex]9\int \frac{1}{x}dx+\int x^{-\frac{1}{2}}dx+\int 1dx[/tex]
Using common integral [tex]\int \frac{1}{x}dx=\text{ln}|x|[/tex], we will get:
[tex]9\text{ln}|x|+\int x^{-\frac{1}{2}}dx+\int 1dx[/tex]
Now, we will use power rule of integrals as:
[tex]9\text{ln}|x|+\frac{x^{-\frac{1}{2}+1}}{-\frac{1}{2}+1}+\int 1dx[/tex]
[tex]9\text{ln}|x|+\frac{x^{\frac{1}{2}}}{\frac{1}{2}}+\int 1dx[/tex]
[tex]9\text{ln}|x|+2x^{\frac{1}{2}}+\int 1dx[/tex]
[tex]9\text{ln}|x|+2\sqrt{x}+\int 1dx[/tex]
We know that integral of a constant is equal to constant times x, so integral of 1 would be x.
[tex]9\text{ln}|x|+2\sqrt{x}+x+C[/tex]
Therefore, our required integral would be [tex]9\text{ln}|x|+2\sqrt{x}+x+C[/tex].
The general indefinite integral of the expression 9 + sqrt(x) + x/x is obtained by separately integrating each term, resulting in the expression 9x + (2/3)x^(3/2) + x + C, where C is the sum of the constants of integration.
Explanation:The question asks to compute the indefinite integral of an algebraic function. Firstly, it's crucial to understand that an indefinite integral is an antiderivative of a function, representing the reverse operation of differentiation. In the given expression, we essentially have three terms to integrate: 9, √x and x/x (which simplifies to 1). To find the integral of these expressions we can use the power rule of integration: ∫x^n dx = x^(n+1)/(n+1) + C, where C is the constant of integration.
When we integrate 9, treating it as 9x^0, it becomes 9x + C1. The integral of the square root of x, which is x^1/2 in exponent form, becomes (2/3)x^(3/2) + C2 according to the power rule. Finally, x/x simplifies to 1, and its integral is simply x + C3.
So, the general indefinite integral of the original expression is 9x + (2/3)x^(3/2) + x + C, where 'C' represents the sum of the constants of integration: C1, C2, and C3.
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Design a sine function with the given properties:
It has a period of 24 hr with a minimum value of 10 at t=4 hr and a maximum value of 16 at t=16 hr.
please show all the steps
To design a sine function with a period of 24 and minima and maxima at given times, we scale the function using a coefficient of 2π/24, shift the function to make the peak occur at x=16, and stretch it by a factor of 3 to make it go from 10 to 16.
Explanation:To design a sine function with a period of 24 and minima and maxima at given times, we first need to understand a few concepts about sine functions. The standard sine function, sine(x), has a period of 2π. Therefore, to stretch it to a period of 24 hours, we would scale the function using a coefficient of 2π/24 or π/12. Thus, our function becomes sine((π/12) x).
Next, we want to shift the function so its maximum occurs at t=16. Normally, the sine function peaks at π/2, so we need to shift the function to the right by an amount that makes the peak occur at x=16. This would be 16 - π/2, which gives us the function sine(π/12 x - 16 + π/2).
Finally, to stretch the function vertically to accommodate the minimum and maximum values of 10 and 16, we note that the amplitude of the sine function is usually 1 (from -1 to 1), so we need to stretch it by a factor of (16-10)/2 = 3 to make it go from 10 to 16. This gives us the function y= 3sin((π/12)x - 16 + π/2)+13.
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This might be hard to explain, but could you try to explain where I should put the points. I’m really confused?
Answer:
im pretty sure you have to find out how far Joel walked and then double joels distance to get Brents
Step-by-step explanation:
Answer:
Step-by-step explanation:
Here is the region of integration of the integral Integral from negative 6 to 6 Integral from x squared to 36 Integral from 0 to 36 minus y dz dy dx. Rewrite the integral as an equivalent integral in the following orders. a. dy dz dx by. dy dx dz c. dx dy dz d. dx dz dy e. dz dx dy
Answer:
a) ∫_{-6}^{6} ∫_{0}^{36} ∫_{x²}^{36} (-y) dy dz dx
b) ∫_{0}^{36} ∫_{-6}^{6} ∫_{x²}^{36} (-y) dy dx dz
c) ∫_{0}^{36} ∫_{x²}^{36} ∫_{-6}^{6} (-y) dx dy dz
e) ∫_{x²}^{36} ∫_{-6}^{6} ∫_{0}^{36} (-y) dz dx dy
Step-by-step explanation:
We write the equivalent integrals for given integral,
we get:
a) ∫_{-6}^{6} ∫_{0}^{36} ∫_{x²}^{36} (-y) dy dz dx
b) ∫_{0}^{36} ∫_{-6}^{6} ∫_{x²}^{36} (-y) dy dx dz
c) ∫_{0}^{36} ∫_{x²}^{36} ∫_{-6}^{6} (-y) dx dy dz
e) ∫_{x²}^{36} ∫_{-6}^{6} ∫_{0}^{36} (-y) dz dx dy
We changed places of integration, and changed boundaries for certain integrals.
HELP PLEASE!
When two functions have an inverse relationship, the line of reflection will be which of the following equations?
Select the correct response(s):
x = 0
y = x
y = 0
y = -x
Thank you!
Answer:
Option C: The line y = x
Step-by-step explanation:
Let us take an ordered pair (x, y) of a function. Then the ordered pair of its inverse function would be (y, x).
That is to say, when we reflect a point (x, y) across the line y = x we get the point (y, x).
Note that since, this function is invertible, it is both 'one - one' and 'onto'.
The line of reflection for two functions with an inverse relationship is the line y = x, as this line shows the symmetry of the original function and its inverse on a graph.
Explanation:When two functions have an inverse relationship, the line of reflection across which their graphs are mirrored is the line y = x. This is because for an inverse relationship, each x value in the first function corresponds to a y value in the second function, and vice versa. Thus, when graphing the original function and its inverse, you will notice that they are symmetric with respect to the line y = x.
What is 10∠ 30 + 10∠ 30? Answer in polar form. Note that the angle is measured in degrees here.
The expression 10∠30 + 10∠30 can be simplified by adding the magnitudes (10 + 10) and keeping the angle the same.
Given, that 10∠ 30 + 10∠ 30 .
In polar form, the magnitude is represented by the absolute value of a complex number and the angle is measured counterclockwise from the positive real axis.
To find the polar form of the sum, we first add the magnitudes: 10 + 10 = 20.
Next, keep the angle the same: 30 degrees.
Therefore, the polar form of 10∠30 + 10∠30 is 20∠30.
This means that the complex number is represented by a magnitude of 20 and an angle of 30 degrees.
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The diameter of a spindle in a small motor is supposed to be 5 mm. If the spindle is either too small or too large, the motor will not work properly. The manufacturer measures the diameter in a sample of motors to determine whether the mean diameter has moved away from the target. What are the null and alternative hypotheses (H0 = null hypothesis and Ha = alternative hypothesis)?
(A) H0: Mean= 5 and Ha: Mean is not equal to 5
(B) H0: Mean = 5 and Ha: Mean <5
(C) H0: Mean < 5 and Ha: Mean > 5
(D) H0: Mean = 5 and Ha: Mean > 5
Answer:
a) H0: mean =5 and Ha: mean≠ 5
Step-by-step explanation:
In hypothesis testing procedure the trait of null hypothesis is that it always contain an equality sign. We are known that diameter of spindle is known to be 5mm. This our null value. Hence the null hypothesis is
H0:μ=5.
Now for alternative hypothesis we are given that the mean diameter has moved away from the target. This means that mean diameter could be increases or decreases from 5mm. Hence the alternative hypothesis is
Ha:μ≠5
From the information given, it is found that the correct option is:
(A) H0: Mean= 5 and Ha: Mean is not equal to 5.
At the null hypothesis, it is tested if the motor works properly, that is, the spindle has diameter significantly close to 5 mm, hence:
[tex]H_0: \mu = 5[/tex]
At the alternative hypothesis, it is tested if the motor does not work properly, that is, the spindle has diameter different from 5 mm, either too high or too low, hence:
[tex]H_a: \mu \neq 5[/tex]
Thus, a is the correct option.
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For what value of theta does sin 2theta = cos(theta+30)?
Show steps
Answer: Ф = 20
Step-by-step explanation:
sin2Ф = cos (Ф+ 30 )
if sinα = cosβ , then α and β are complementary ,that is they add up to be [tex]90^{0}[/tex].
Therefore : 2Ф + Ф + 30 = 90
3Ф + 30 = 90
3Ф = 90 - 30
3Ф = 60
Ф = 20
On Julyâ 1, a pond was 22 ft deep. Since thatâ date, the water level has dropped two thirds ft per week. For what dates will the water level not exceed 18 âft?
Answer: The date in which the water level will not exceed 18ft is August 12 ( 6 weeks after July 1)
Step-by-step explanation:
Given:
Initial water level = 22ft
Final water level = 18ft
Total water level change = 22-18 = 4ft
Rate of change of water level = 2/3 ft/week
Using the formula;
Total change = rate × time
Time = total change/rate
Substituting the values of the rate and total water level change.
Time = 4/(2/3) week = 4 × 3 ÷2 = 6weeks.
From July 1 + 6 weeks = August 12
The date in which the water level will not exceed 18ft is August 12 ( 6 weeks after July 1)
Final answer:
To find the dates when the water level will not exceed 18 ft, we set up an inequality based on the given situation and solve it to determine the range of weeks when the water level stays below 18 ft.
Explanation:
To find the dates when the water level will not exceed 18 ft, we need to set up an inequality based on the given situation.
Initial depth of the pond = 22 ftThe water level drops by two-thirds each week, so the depth after 'w' weeks = 22 - (2/3)wWe need to find 'w' when the water level is 18 ft or above: 22 - (2/3)w ≥ 18By solving the inequality, we can determine the range of weeks when the water level will not exceed 18 ft.
Popular magazines rank colleges and universities on their academic quality in serving undergraduate students. Below are several variables that might contribute to ranking colleges. Which of these are categorical and which are quantitative? Write 'QUANTITATIVE' for quantitative and "CATEGORICAL" for categorical (without quotations). (a) Percent of freshmen who eventually graduate. Answer (b) G.PA of incoming freshmen. Answer: (c) Require SAT or ACT tor admission (required, recommended, not used)"? Answer (d) College type liberal arts college, national university, etc. Answer:
Answer:
a) Quantitative
b) Quantitative
c) Qualitative
d) Qualitative
Step-by-step explanation:
a)
Percent of freshmen that will eventually graduate is a quantitative variable because it can be presented numerically for example 84% or 78% etc.
b)
GPA of incoming freshman is a quantitative variable because it can be presented by numerical quantities.
c)
Require SAT or ACT for admission is a categorical variable because it is divided into categories such as required, recommended and not used.
d)
College type is a categorical variable because it is divided into categories such as liberal arts college and national university etc.
The variables 'percent of freshmen who eventually graduate' and 'G.P.A of incoming freshmen' are quantitative because they can be measured numerically. The variables 'Require SAT or ACT for admission' and 'College type' are categorical because they are classified into specific categories.
Explanation:In regards to the variables that contribute to the ranking of colleges, (a) The 'percent of freshmen who eventually graduate' can be identified as a QUANTITATIVE variable since it is a number that can be measured. For instance, an outcome could be '85% of freshmen graduate'.
(b) The 'GPAs of incoming freshmen' is also a QUANTITATIVE variable as it can also be measured numerically. An example could be 'The average GPA of incoming freshmen is 3.7 out of 4.0'.
(c) Whether or not a college 'requires SAT or ACT for admission' is a CATEGORICAL variable as it describes a category or characteristic, for example, the admission requirement can be one of the following: required, recommended or not used.
(d) Lastly, 'college type (liberal arts college, national university, etc.)' is also a CATEGORICAL variable, because it represents different types of educational institutions which are distinguished by categories.
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Find the probability of the given event Choosing five numbers that match five randomly selected balls when the balls are numbered 1 through 36 The probability of the given event is ___ (Type an integer or a simplified fraction.)
Final answer:
The probability of correctly choosing five random numbers from balls numbered 1 to 36 is calculated by multiplying the probability of choosing each number correctly, which is (1/36)^5, rounded to 0.0000 to four decimal places.
Explanation:
The student is asking about the probability of choosing five numbers that match five randomly selected balls when the balls are numbered 1 through 36. This is a question of combinatorial probability, where we are interested in the probability of one specific outcome in a set of possibilities.
To solve this, we need to calculate the probability of choosing each ball correctly. The probability of choosing the first number correctly is 1/36, since there is only one correct number out of 36. Likewise, the probability of choosing the second number correctly is also 1/36, and the same logic applies for the third, fourth, and fifth numbers. As these events are all independent (choosing one number does not affect the others), we can find the total probability by multiplying the individual probabilities together:
P(choosing all five numbers correctly) = P(choosing 1st number correctly) × P(choosing 2nd number correctly) × ... × P(choosing 5th number correctly) = (1/36)^5.
The exact value of this probability is quite small, and one would usually leave it as a fraction to avoid rounding errors. However, the instructions specify to round to four decimal places, so let's calculate:
(1/36)^5 = 1/60466176, which is a very small likelihood and as a decimal, it's approximately 0.0000000165, but you can rounded to 0.0000 when expressing it to four decimal places as per instruction.
Complete 1: What is spatial autocorrelation, and why is it important in crime mapping and spatial-behavioral studies?
Answer: Spatial correlation is defined as a specific relationship between spatial proximity among observational units and numeric similarities among values.
Step-by-step explanation: Spatial analysis focuses on individual as units located in spatial oriented structures such as gangs. In crime mapping and behavioral studies, spatial autocorrelation is used to determine the adjacency between area of influence and individuals within an area.