Statistics for Engineers and Scientists
4th Edition
ISBN: 9780073401331
Author: William Navidi Prof.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 5.7, Problem 6E
A sample of 10 diesel trucks were run both hot and cold to estimate the difference in fuel economy. The results, in mpg, are presented in the following table. (From “In-use Emissions from Heavy-Duty Diesel Vehicles,” J. Yanowitz, Ph.D. thesis, Colorado School of Mines, 2001.)
| Truck | Hot | Cold |
| 1 | 4.56 | 4.26 |
| 2 | 4.46 | 4.08 |
| 3 | 6.49 | 5.83 |
| 4 | 5.37 | 4.96 |
| 5 | 6.25 | 5.87 |
| 6 | 5.90 | 5.32 |
| 7 | 4.12 | 3.92 |
| 8 | 3.85 | 3.69 |
| 9 | 4.15 | 3.74 |
| 10 | 4.69 | 4.19 |
Find a 98% confidence interval for the difference in mean fuel mileage between hot and cold engines.
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Chapter 5 Solutions
Statistics for Engineers and Scientists
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