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A manufacturer has designed a process to produce pipes that are 10 feet long. The distribution of the pipe length, however, is actually Uniform on the interval 10 feet to 10.57 feet. Assume that the lengths of individual pipes produced by the process are independent. Let X and Y represent the lengths of two different pipes produced by the process.
What is the probability that the second pipe (with length Y) is more than 0.15 feet longer than the first pipe (with length X)? Give your answer to four decimal places. Hint: Do not use calculus to get your answer.
If the restaurant stocks 400 hamburgers and 150 chicken sandwiches for a given day, what is the probability that it will run out of hamburgers or chicken sandwiches (or both) that day? Assume that the demand for hamburgers and the demand for chick..
Verify that the fitted values have the same mean as the actual y-values, and that the residuals have mean zero and show that the variance of the fitted values plus the variance of the residuals adds up to the variance of y. Find the R-squared.
Explain how the power of a hypothesis test is influenced by each of the following. Assume that all other factors are held constant.
If they enroll this many pupils, how much would they need to charge per pupils in order to realize their profit goal of $5,000.
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
Which of the following preference orderings, if any, could characterize his preferences? Tell me any/all that apply, and explain how you know this.
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
a company studied the number of lost-time accidents occurring at its brownsville texas plant. historical records show
Make a plot of the residuals and comment on whether they appear to follow a normal distribution. Plot the residuals versus the fitted values. Do they seem to have the same amount of variation?
Find out point estimate and 95% confidence interval for mean family dental expenses of all employees of company.
Use Friedman test to find out whether there is evidence for significant difference between two population variance. Use .05 level of significance.
A health researcher is interested in determining whether or not the speed at which people walk is related to their cholesterol levels. He picks 100 adult volunteers at random, checks their cholesterol levels, and then times each one while they wal..
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