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Unformatted text preview: CHAPTER 7 HYPOTHESIS TESTING 7.16 H : μ = 31.5 ; H 1 : μ ≠ 31.5 n = 100 x = 29.8 s = 6.6; z = 2.575 . The pvalue is approximately 0.01 Reject H at α = 0.05 (and almost at α = .01). 718 H : μ = 5 H 1 : μ ≠ 5 α = .05 n = 120 x = 2.3 s = 1.5; z =  19.72 Reject H at α = .05 and at smaller α levels. Average miles traveled per day is probably smaller than 5. Changes in service may be necessary. 7.20 H : μ = 4.3 H 1 : μ ≠ 4.3 n = 50 x = 3.8 s = 1.1 α = .05; Reject H at any α ( pvalue = 0.1454). 7.23 H : μ = 27 H 1 : μ ≠ 27 n = 43 s = 4.954 x = 24.53 α = .05; Critical value for right side:  1.96 z =  3.269. pvalue = .0011. Reject H , average staff age is under 27 years old. 24 H : μ = 0 H 1 : μ ≠ 0; n = 13 x = 3.1 s =1. t t = 11.177 The pvalue is very small. Reject H . Inclusion in the index likely increases average stock return (at least initially). 26 H : μ = 2.5 H 1 : μ ≠ 2.5 n = 20 x = 2.3 σ = 0.8 Use z because the population is normal and σ is known. is known....
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This note was uploaded on 11/24/2010 for the course MATH BAOI taught by Professor Phong during the Spring '10 term at Wash. College.
 Spring '10
 Phong

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