Essentials Of Statistics For Business & Economics

9th Edition

ISBN: 9780357045435

Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran

Publisher: South-Western College Pub

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Textbook Question

Chapter 12, Problem 28SE

Quality Comparison Across Production Shifts. Arconic Inc. is a producer of aluminum components for the avionics and automotive industries. At its Davenport Works plant, an engineer has conducted a quality-control test in which aluminum coils produced in all three shifts were inspected. The study was designed to determine if the population proportion of good parts was the same for all three shifts. Sample data follow.

Chapter 12, Problem 28SE, Quality Comparison Across Production Shifts. Arconic Inc. is a producer of aluminum components for

a. Using a .05 level of significance, conduct a hypothesis test to determine if the population proportion of good parts is the same for all three shifts. What is the p-value and what is your conclusion?
b. If the conclusion is that the population proportions are not all equal, use a multiple comparison procedure to determine how the shifts differ in terms of quality. What shift or shifts need to improve the quality of parts produced?

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Chapter 12 Solutions

Essentials Of Statistics For Business & Economics

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Solution Summary: The author states the hypothesis test to determine if the population proportion of good parts is the same for all three shifts.

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Chapter 12 Solutions