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 15.1, Problem 5E
Both a gravimetric and a spectrophotometric method are under consideration for determining phosphate content of a particular material. Twelve samples of the material are obtained, each is split in half, and a determination is made on each half using one of the two methods, resulting in the following data:
Sample | 1 | 2 | 3 | 4 |
Gravimetric | 54.7 | 58.5 | 66.8 | 46.1 |
Spectrophotometric | 55.0 | 55.7 | 62.9 | 45.5 |
Sample | 5 | 6 | 7 | 8 |
Gravimetric | 52.3 | 74.3 | 92.5 | 40.2 |
Spectrophotometric | 51.1 | 75.4 | 89.6 | 38.4 |
Sample | 9 | 10 | 11 | 12 |
Gravimetric | 87.3 | 74.8 | 63.2 | 68.5 |
Spectrophotometric | 86.8 | 72.5 | 62.3 | 66.0 |
Use the Wilcoxon test to decide whether one technique gives on average a different value than the other technique for this type of material.
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Chapter 15 Solutions
Probability and Statistics for Engineering and the Sciences
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