Probability and Statistics for Engineering and the Sciences
9th Edition
ISBN: 9781305251809
Author: Jay L. Devore
Publisher: Cengage Learning
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Textbook Question
Chapter 8.3, Problem 35E
The article “Uncertainty Estimation in Railway Track Life-Cycle Cost” (J. of Rail and Rapid Transit, 2009) presented the following data on time to repair (min) a rail break in the high rail on a curved track of a certain railway line.
A normal
- a. Is there compelling evidence for concluding that true average repair time exceeds 200 min? Carry out a test of hypotheses using a significance level of .05.
- b. Using σ = 150, what is the type II error probability of the test used in (a) when true average repair time is actually 300 min? That is, what is β(300)?
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Chapter 8 Solutions
Probability and Statistics for Engineering and the Sciences
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