Question: Using techniques from Section 8.2, we can find a confidence interval for Î¼d. Consider a random sample of n matched data pairs A, B. Let

Using techniques from Section 8.2, we can find a confidence interval for Î¼d. Consider a random sample of n matched data pairs A, B. Let d = B - A be a random variable representing the difference between the values in a matched data pair. Compute the sample mean of the differences and the sample standard deviation sd. If d has a normal or is mound-shaped, or if n ‰¥ 30, then a confidence interval for Î¼d is
- E + E
where

c = confidence level (0 tc = critical value for confidence level c and d.f. = n - 1
(a) Using the data of problem 9, find a 95% confidence interval for the mean difference between percentage increase in company revenue and percentage increase in CEO salary.
(b) Use the confidence 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 significance.

Using techniques from Section 8.2, we can find a confidence

1 B: Percentage increase 24 23 25 8 642 37 for company A: Percentage increase 21 25 20 15 30 for CEO -4

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