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Unformatted text preview: CEE 3770  Summer 2009 Homework 3 (due on 06/18) 1. An apparel and shoe trade association has 8,900 member firms. As a part of a study of the impact of new minimumwage legislation on association members, a random sample of 400 member firms was selected to estimate μ , the mean number of hourlypaid employees in member firms. A computer analysis of the sample results showed: X = 8 . 31, where X denotes the number of hourly paid employees in a firm. Suppose that you know that X is normal distributed with known variance σ 2 = 4 . 16 2 . (a) Construct 94% confidence interval for μ . (b) If you had constructed a 99% confidence interval, would it have been wider or narrower than one in (a)? 2. The EPA standard on the amount of suspended solids discharged into rivers and streams is a maximum of 60 milligrams per liter daily, with a maximum monthly average of 30 milligrams per liter. Suppose you want to test a randomly selected sample of n water specimens and estimate the mean daily rate of pollution produced by the mining operation. If you want 95%estimate the mean daily rate of pollution produced by the mining operation....
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This note was uploaded on 06/29/2009 for the course CEE 3770 taught by Professor Staff during the Spring '08 term at Georgia Tech.
 Spring '08
 Staff

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