Probability and Statistics for Engineering and the Sciences STAT 400 - University Of Maryland
9th Edition
ISBN: 9781305764477
Author: Jay L. Devore
Publisher: Cengage Learning
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Textbook Question
Chapter 7.1, Problem 10E
A random sample of n = 15 heat pumps of a certain type yielded the following observations on lifetime (in years):
- a. Assume that the lifetime distribution is exponential and use an argument parallel to that of Example 7.5 to obtain a 95% CI for expected (true average) lifetime.
- b. How should the interval of part (a) be altered to achieve a confidence level of 99%?
- c. What is a 95% CI for the standard deviation of the lifetime distribution? [Hint: What is the standard deviation of an exponential random variable?]
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Chapter 7 Solutions
Probability and Statistics for Engineering and the Sciences STAT 400 - University Of Maryland
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