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1Jumer 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 o = 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. A sample of 15 Costco customer satisfaction sc follow

1Jumer 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 o = 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. A sample of 15 Costco customer satisfaction sc follow

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Please answer asap. Problem 10, letter d only. Thanks!
9. An automotive part must be machined to close tolerances to be acceptable to customers. Production specifications call for a maximum variance in the lengths of the parts of .0004. Suppose the sample variance for 30 parts turns out to be s whether the population variance specification is being violated. .0005. Use a = .05 to test (10. ) 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 o = 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. A sample of 15 Costco customer satisfaction scores follows. 95 90 83 75 95 98 80 83 82 93 86 80 94 64 62 What is the sample mean customer satisfaction score for Costco? b. What is the sample variance? What is the sample standard deviation? d. Construct a hypothesis test to determine whether the population standard deviation of o = 12 should be rejected for Costco. With a .05 level of significance, what is your a. с. conclusion? 11. The variance in GMAT exam scores is 14,660 (the Graduate Management Admis- sion Council's official website of the GMAT, June 17, 2016). A group of economics
Transcribed Image Text:9. An automotive part must be machined to close tolerances to be acceptable to customers. Production specifications call for a maximum variance in the lengths of the parts of .0004. Suppose the sample variance for 30 parts turns out to be s whether the population variance specification is being violated. .0005. Use a = .05 to test (10. ) 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 o = 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. A sample of 15 Costco customer satisfaction scores follows. 95 90 83 75 95 98 80 83 82 93 86 80 94 64 62 What is the sample mean customer satisfaction score for Costco? b. What is the sample variance? What is the sample standard deviation? d. Construct a hypothesis test to determine whether the population standard deviation of o = 12 should be rejected for Costco. With a .05 level of significance, what is your a. с. conclusion? 11. The variance in GMAT exam scores is 14,660 (the Graduate Management Admis- sion Council's official website of the GMAT, June 17, 2016). A group of economics
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