Mathematical Ideas (13th Edition) - Standalone book
13th Edition
ISBN: 9780321977076
Author: Charles D. Miller, Vern E. Heeren, John Hornsby, Christopher Heeren
Publisher: PEARSON
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Textbook Question
Chapter 12.3, Problem 39E
Lifetimes of Engine Control Modules Chin manages the service department of a trucking company. Each truck in the fleet utilizes an electronic engine control module. Long-lasting modules are desirable. A preventive replacement program also avoids costly breakdowns. For this purpose it is desirable that the modules be fairly consistent in their lifetimes, so that preventive replacements can be timed efficiently.
Chin tested a sample of 20 Brand A modules, and they lasted 48.560 highway miles on the average (mean), with a standard deviation of 2116 miles. The listing below shows how long each of another sample of 20 Brand B modules lasted. Use these data for Exercises 38-40.
| 44.660 | 51.300 | 45.680 | 48.840 | 47.510 |
| 61.220 | 49.100 | 48.660 | 47.790 | 47.210 |
| 48.050 | 49.920 | 47,420 | 45,880 | 50.110 |
| 52.910 | 47.930 | 45.800 | 46.690 | 49.240 |
Which brand of module apparently has a more consistent (or uniform) length of life (in highway miles)?
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Chapter 12 Solutions
Mathematical Ideas (13th Edition) - Standalone book
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