Probability and Statistics for Engineering and the Sciences
9th Edition
ISBN: 9781305251809
Author: Jay L. Devore
Publisher: Cengage Learning
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Chapter 10.3, Problem 27E
Although tea is the world’s most widely consumed beverage after water, little is known about its nutritional value. Folacin is the only B vitamin present in any significant amount in tea, and recent advances in assay methods have made accurate determination of folacin content feasible. Consider the accompanying data on folacin content for randomly selected specimens of the four leading brands of green tea. folacin content for randomly selected specimens of the four leading brands of green tea.
| 1: | 7.9 | 6.2 | 6.6 | 8.6 | 8.9 | 10.1 9.6 |
| 2: | 5.7 | 7.5 | 9.8 | 6.1 | 8.4 | |
| 3: | 6.8 | 7.5 | 5.0 | 7.4 | 5.3 | 6.1 |
| 4: | 6.4 | 7.1 | 7.9 | 4.5 | 5.0 | 4.0 |
(Data is based on "Folacin Content of Tea,” J. of the Amer. Dietetic Assoc., 1983: 627-632.) Does this data suggest that true average folacin content is the same for all brands?
a. Carry out a test using α = .05.
b. Assess the plausibility of any assumptions required for your analysis in part (a).
c. Perform a multiple comparisons analysis to identify significant differences among brands.
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Chapter 10 Solutions
Probability and Statistics for Engineering and the Sciences
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