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 9.4, Problem 57E
Two different types of alloy, A and B, have been used to manufacture experimental specimens of a small tension link to be used in a certain engineering application. The ultimate strength (ksi) of each specimen was determined, and the results are summarized in the accompanying frequency distribution
| A | B | |
| 26- <30 | 6 | 4 |
| 30- <34 | 12 | 9 |
| 34- <38 | 15 | 19 |
| 38 - <42 | 7 | 10 |
| m = 40 | m = 42 |
Compute a 95% CI for the difference between the true proportions of all specimens of alloys A and B that have an ultimate strength of at least 34 ksi.
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Chapter 9 Solutions
Probability and Statistics for Engineering and the Sciences
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