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Suppose two random variables X and Y are independent with X ~ N(2,4) and Y ~ N(0,3). W= (X-Y)/2
The distribution of the amount of money in savings accounts for University of Alabama students has an average of 950 dollars and a standard deviation of 1,000 dollars.
We will take a random sample of 50 American adults and ask them if they agree with the statement. Then the sampling distribution of the sample proportion of people who answer yes to the question is:
Please find the standard deviation and show your step-by-step method.
Describe the differences between discrete and continuous (normal) probability distributions. What are some business-related examples that make use of discrete and continuous (normal) probability dis
Explain why it is conventional to take the square root using the following set of measurements of pH in Waller Creek to illustrate your logic: pH measurements: 7.34 7.48 7.12 7.33 7.28 7.41 7.22 7.3
Sports Authority conducted a research about the demographics of their customers. For the study they collected data about the following variables: gender, marital status, credit rating (low, medium,
We rolled two six-sided dice, one with sides 1, 2, 2, 3, 3, 4 and the other with sides 1, 3, 4, 5, 6, 8. What is the distribution of the sum?
Find the mode of the number of particles to hit the counter. Find the chance that at most 5 particles hit the counter.
In the World Series of baseball, two teams A and B play a sequence of games against each other, and the first team that wins a total of four games becomes the winner of the World Series.
Suppose we roll one die repeatedly and let Ni be the number of the roll on which i first appears. Find the joint distribution of N1 and N6.
State your null and alternative hypotheses. Calculate the mean and standard deviation for each group. Compare the two group means and test your hypothesis. State your conclusion in terms of the hypot
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of u = 112 and a standard deviation of o = 33.
Under normal circumstances (without music), the scores on the test form a normal-shaped distribution with a mean of u = 25 and a standard deviation of o = 6. The sample produces a mean score of M=28
A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n=25 third-grade children is selected to participate in the program
Suppose IQ scores were obtained from randomly selected couples. For 20 such pairs, of people the linear correlation coefficient is 0.799 and the equation of the regression line is ^y=-13.82+0.87x.
On average, 9 babies are born per 24-hour day at a hospital in Indianapolis. a) What is the probability that at least one baby will be born today between 6 am and 6 pm?
The blood pressure measurements of a single patient were taken by twelve different medical students and the results are listed below. Construct a scatterplot, find the value of the linear correlatio
Listed below are the playing times (in seconds) of songs that were popular at the time of this writing. Find the (a)mean, (b)median(c)mode, and (d) midrange for the given sample data. Is there one
Based on the team's claims about waiting time, what is the probability that a sample mean for n = 25 people would be as large or larger than 4.2 minutes?
Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3968. Find the standard score (z) such that the area above the mean and below z under the normal c
Assuming the amount of fill is normally distributed, what is the probability that the next randomly checked bottle contains more than 31.24 oz? (Give your answer correct to four decimal places.
From the following list, single out those measurements for which the square root of a typical measurement is a proper estimate of the standard deviation of the distribution from which the measuremen
A basket of eggs contains 18 eggs, 7 of which are cracked. if we randomly select 8 of the eggs for hard boiling, what is the probability of the following events.
Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3975. Find the standard score (z) such that the area above the mean and below z under the normal c