Ch7_selected_Hypothesis_Testing

Ch7_selected_Hypothesis_Testing - CHAPTER 7 HYPOTHESIS...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 p-value is approximately 0.01 Reject H at α = 0.05 (and almost at α = .01). 7-18 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 ( p-value = 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. p-value = .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 p-value 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....
View Full Document

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.

Page1 / 2

Ch7_selected_Hypothesis_Testing - CHAPTER 7 HYPOTHESIS...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online