Prob 9.30

# Prob 9.30 - 9.30 Textbook answer key solution Two-tailed...

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9.30. Textbook answer key solution: Two-tailed test. Given: μ 0 = 600,000 (= 600K) n = 40 xbar = 612,000 (= 612 K) s = 65,000 (= 65K) Use: α = 0.10 a. Daily viewership is 600,000 (600 K) as claimed or it isn’t (it could be either higher or lower and which is irrelevant). So this is a right-tailed test. The pair of mutually exclusive hypotheses is: H 0 : μ = 600 H a : 600 This is a two-tailed test. b . Given for the sample of n = 40: xbar = 612 K with s = 65 K 168 . 1 40 65 600 612 0 = = μ = - - n s x t Degrees of freedom df = n – 1 = 39 Using t table: Search the row df = 39 for a value of 1.168 or close. Reading across the row, the value 1.168 is between 0.851 and 1.304. Reading up the column from .0851 to the header, the area = 0.20. Reading up from 1.304 to the header, the area = 0.10. The p -value is two times the upper tail area. Using t table: area in upper tail is between 0.10 and 0.20. Therefore, the

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## This note was uploaded on 02/19/2011 for the course OM 210 taught by Professor Singer during the Spring '08 term at George Mason.

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Prob 9.30 - 9.30 Textbook answer key solution Two-tailed...

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