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Refer to Exercise 10.21. Construct a 99% confidence

Mathematical Statistics with Applications | 7th Edition | ISBN: 9780495110811 | Authors: Dennis Wackerly; William Mendenhall; Richard L. Scheaffer ISBN: 9780495110811 47

Solution for problem 45E Chapter 10

Mathematical Statistics with Applications | 7th Edition

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Mathematical Statistics with Applications | 7th Edition | ISBN: 9780495110811 | Authors: Dennis Wackerly; William Mendenhall; Richard L. Scheaffer

Mathematical Statistics with Applications | 7th Edition

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Problem 45E

Problem 45E

Refer to Exercise 10.21. Construct a 99% confidence interval for the difference in mean shear strengths for the two soil types.

a Is the value μ1 − μ2 = 0 inside or outside this interval?

b Based on the interval, should the null hypothesis discussed in Exercise 10.21 be rejected? Why?

c How does the conclusion that you reached compare with your conclusion in Exercise 10.21?

Reference

Shear strength measurements derived from unconfined compression tests for two types of soils gave the results shown in the following table (measurements in tons per square foot). Do the soils appear to differ with respect to average shear strength, at the 1% significance level?

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Chapter 10, Problem 45E is Solved
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Textbook: Mathematical Statistics with Applications
Edition: 7
Author: Dennis Wackerly; William Mendenhall; Richard L. Scheaffer
ISBN: 9780495110811

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Refer to Exercise 10.21. Construct a 99% confidence