EBK STATISTICS FOR BUSINESS & ECONOMICS
12th Edition
ISBN: 8220100460463
Author: Anderson
Publisher: CENGAGE L
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Chapter 11.1, Problem 10E
Consumer Reports uses a 100-point customer satisfaction score to rate the nation’s major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of σ = 12 is expected. In 2012, Costco, with its 432 warehouses in 40 states, was the only chain store to earn an outstanding rating for overall quality (Consumer Reports, March 2012). A sample of 15 Costco customer satisfaction scores follows.
- a. What is the sample
mean customer satisfaction score for Costco? - b. What is the sample variance?
- c. What is the sample standard deviation?
- d. Construct a hypothesis test to determine whether the population standard deviation of σ = 12 should be rejected for Costco. With a .05 level of significance, what is your conclusion?
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Chapter 11 Solutions
EBK STATISTICS FOR BUSINESS & ECONOMICS
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