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% conﬁdence interval to answer this question. 4) Work problem 11.18 in the text. In addition to the 95% conﬁdence interval build a 90% and 99% CI. Interpret these intervals. What can you say about the diﬀerences 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 pvalues and test the hypothesis: H O : μ = 170 H A : μ < 170 at the 0.1, 0.05 and 0.01 level. 1...
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This note was uploaded on 04/08/2008 for the course ECON 3070 taught by Professor Loh,joyce during the Spring '07 term at Colorado.
 Spring '07
 LOH,JOYCE

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