A well-known buyer's guide uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience...
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A well-known buyer's guide uses a 100-point customer satisfaction

score to rate the nation's major chain stores. Assume that from past experience with the satisfaction score, a population variance of 144 is expected. In 2019, Walmart was the only chain store to earn an outstanding rating for overall quality. However, critics argue that although their average was higher, so to was the variance. A sample of 30 Walmart customer satisfaction scores showed an average of 91.4 with a sample standard deviation of 14.3. You've been asked to test the critics' claim at a maximum allowable exposure to a Type I error of 10%.

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