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Unformatted text preview: year. We take a sample of 30 students on campus receiving work study. Their average income is $3800 a year with a variance of $1200. Does the average work study student earn more than $4000 per year? Build a 95% condence interval to answer this question. 4) Work problem 11.18 in the text. In addition to the 95% condence interval build a 90% and 99% CI. Interpret these intervals. What can you say about the dierences in the two populations. 5) We calculate the average weight of 25 high school seniors in Boulder is 155 pounds. The sample variance is 200. Find the p-values and test the hypothesis: H O : = 170 H A : < 170 at the 0.1, 0.05 and 0.01 level. 1...
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- Spring '07