Homework10Solutions

Homework10Solutions - Steven Weber Dept. of ECE Drexel...

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Unformatted text preview: Steven Weber Dept. of ECE Drexel University ENGR 361: Statistical Analysis of Engineering Systems (Spring, 2008) Homework 10 Solutions (Monday, June 2) Question 1: #1, 7.1, p262. Consider a normal population with the value of known. a. What is the confidence level for the interval x 2 . 81 / n ? (2 . 81) = 0 . 9975 1- / 2 = 0 . 9975 1- = 0 . 995 . (1) b. What is the confidence level for the interval x 1 . 44 / n ? (1 . 44) = 0 . 9251 1- / 2 = 0 . 9251 1- = 0 . 85 . (2) c. What value of z / 2 in the CI formula (7.5) results in a confidence level of 99 . 7% ? 1- = 0 . 997 1- / 2 = 0 . 9985 (2 . 97) = 0 . 9985 z / 2 = 2 . 97 . (3) d. Answer the question posed in part (c) for a confidence level of 75% . 1- = 0 . 75 1- / 2 = 0 . 875 (1 . 15) = 0 . 875 z / 2 = 1 . 15 . (4) Question 2: #3, 7.1, p262. Suppose that a random sample of 50 bottles of a particular brand of cough syrup is selected and the alcohol content of each bottle is determined. Letis selected and the alcohol content of each bottle is determined....
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This note was uploaded on 06/24/2008 for the course ENGR 361 taught by Professor Eisenstein during the Spring '04 term at Drexel.

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Homework10Solutions - Steven Weber Dept. of ECE Drexel...

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