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# 409Hw04 - STAT 409 Fall 2005 Homework#4(due Friday...

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STAT 409 Fall 2005 Homework #4 (due Friday, September 25, by 4:00 p.m.) From the textbook: 6.4-8 6.4-10 6.4-12 6.4-18 6.8-2 6.8-4 6.8-6 6.5-2 “Hint”: Equal variances 6.5-4 10. The National Security Agency (NSA) hires you to compute a 95% confidence interval for the overall average maximum weight (in pounds) its agents can bench press in a 6-repetition set. Stressing the top secret nature of the data, the NSA does not make the data available to you, it does not even report the values of the sample mean and the sample standard deviation. The only information you have is that an 80% confidence interval based on a sample of 14 agents is (273, 300). Assume the population is approximately normally distributed. Compute a 95% confidence interval for the overall average maximum weight NSA agents can bench press in a 6-repetition set. 11. The following numbers represent the scores on a particular test before and after a review session for n = 5 students: 1 2 3 4 5 Before 26 19 20 15 19 After 30 22 25 19 26 Construct a 95% confidence interval for the average increase is scores.

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