Probability and Statistics for Engineering and the Sciences
Probability and Statistics for Engineering and the Sciences
9th Edition
ISBN: 9781305251809
Author: Jay L. Devore
Publisher: Cengage Learning
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Chapter 7.3, Problem 41E

A more extensive tabulation of t critical values than what appears in this book shows that for the t distribution with 20 df, the areas to the right of the values .687, .860, and 1.064 are .25, .20, and .15, respectively. What is the confidence level for each of the following three confidence intervals for the mean μ of a normal population distribution? Which of the three intervals would you recommend be used, and why?

  1. a. ( x ¯ .687 s / 21 , x ¯ + 1 .725 s / 21 )
  2. b. ( x ¯ .860 s / 21 , x ¯ + 1 .325 s / 21 )
  3. c. ( x ¯ 1.064 s / 21 , x ¯ + 1 .064 s / 21 )
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Chapter 7 Solutions

Probability and Statistics for Engineering and the Sciences

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