Statistics for Engineers and Scientists
4th Edition
ISBN: 9780073530789
Author: Navidi
Publisher: MCG
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Textbook Question
Chapter 9.2, Problem 12E
Refer to Exercise 18 in Section 9.1.
- a. Use the Fisher LSD method to find a 95% confidence interval for the difference between the means for annularly threaded and smooth shank nails.
- b. Use the Tukey–Kramer method to determine which pairs of nail types, if any, differ at the 5% level.
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Refer to Exercise 18 in Section 9.1. a) Use the Fisher LSD method to find a 95% confidence interval for the difference between the means for annularly threaded and smooth shank nails. b) Use the Tukey–Kramer method to determine which pairs of nail types, if any, differ at the 5% level.
Refer to Exercise 16 in Section 9.1. a) Use the Fisher LSD method to find a 95% confidence interval for the difference between the means for a diameter of 16 and a diameter of 36. b) Use the Tukey–Kramer method to determine which pairs of diameters, if any, differ at the 5% level.
A U.S. Food Survey showed that Americans routinely eat beef in their diet. Suppose that in a study of 49 consumers in Illinois and 64 consumers in Texas the following results were obtained from two samples regarding average yearly beef consumption:
Illinois Texas
= 49 = 64
= 54.1lb = 60.4lb
S1 = 7.0 S2 = 8.0
Develop a 95% confidence Interval Estimate for the difference between the two population means.
Chapter 9 Solutions
Statistics for Engineers and Scientists
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