Expand Your Knowledge Confi dence Intervals for md Using techniques from Section 8 2, we can fi nd a confi dence interval for md Consider a random sample of n matched data pairs A, B Let d 5 B A be a random variable representing the difference between the values in a matched data pair Compute the sample mean d of the differences and the sample standard deviation sd If d has a normal distribution or is mound shaped, or if n 30, then a confi dence interval for md is (a) Using the data of problem 9, fi nd a 95 confi dence interval for the mean difference between percentage increase in company revenue and percentage increase in CEO salary (b) Use the confi dence interval method of hypothesis testing outlined in problem 25 of Section 9 2 to test the hypothesis that the population mean percentage increase in company revenue is different from that of CEO salary Use a 5 level of signifi cance Ed

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Question: Expand Your Knowledge: Confi dence Intervals for md Using techniques from Section 8.2, we can fi nd a confi dence interval for md. Consider a

Expand Your Knowledge: Confi dence Intervals for md Using techniques from Section 8.2, we can fi nd a confi dence interval for md. Consider a random sample of n matched data pairs A, B. Let d 5 B A be a random variable representing the difference between the values in a matched data pair. Compute the sample mean d of the differences and the sample standard deviation sd. If d has a normal distribution or is mound-shaped, or if n 30, then a confi dence interval for md is - Ed

(a) Using the data of problem 9, fi nd a 95% confi dence interval for the mean difference between percentage increase in company revenue and percentage increase in CEO salary.

(b) Use the confi dence interval method of hypothesis testing outlined in problem 25 of Section 9.2 to test the hypothesis that the population mean percentage increase in company revenue is different from that of CEO salary. Use a 5% level of signifi cance.

- Ed

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