Statistics for Engineers and Scientists
4th Edition
ISBN: 9780073401331
Author: William Navidi Prof.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 9.2, Problem 10E
Refer to Exercise 9 in Section 9.1.
- a. Use the Fisher LSD method to find a 95% confidence interval for the difference between the means for temperatures of 70° C and 90° C.
- b. Use the Tukey–Kramer method to determine which pairs of temperatures, if any, differ at the 5% level.
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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.
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.
1. The following table illustrates the BMI for a number of patients recently enrolled in a study investigating the relationship between BMI and type 2 diabetes.
Participant
BMI (kg/m2)
A
26.5
B
19.2
C
29.7
D
27.4
E
30.2
F
28.9
A) Assuming the participants can be considered to be normally distributed, and that they comefrom a population with a σ=2.4 kg/m2, calculate a 95% confidence interval for the mean BMI ofthe population for which they represent.B) Correctly interpret the confidence interval you found above.
Chapter 9 Solutions
Statistics for Engineers and Scientists
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