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A random sample of the costs of repair jobs at a large muffler repair shop produces a mean of $127.95 and a standard deviation of $24.03. If the size of this sample is 40, which of the following is an approximate 90 percent confidence interval for the average cost of a repair at this repair shop? (A) $127.95±$4.87 (B) $127.95±$6.25 (C) $127.95±$7.45 (D) $127.95±$30.81 (E) $127.95±$39.53

A random sample of the costs of repair jobs at a large muffler repair shop produces a mean of $127.95 and a standard deviation of $24.03. If the size of this sample is 40, which of the following is an approximate 90 percent confidence interval for the average cost of a repair at this repair shop? (A) $127.95±$4.87 (B) $127.95±$6.25 (C) $127.95±$7.45 (D) $127.95±$30.81 (E) $127.95±$39.53

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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例题 10 A random sample of the costs of repair jobs at a large muffler repair shop produces a mean of $127.95 and a standard deviation of $24.03. If the size of this sample is 40, which of the following is an approximate 90 percent confidence interval for the average cost of a repair at this repair shop? (A) $127.95±$4.87 (B) $127.95±$6.25 (C) $127.95±$7.45 (D) $127.95±$30.81 (E) $127.95±$39.53
Transcribed Image Text:例题 10 A random sample of the costs of repair jobs at a large muffler repair shop produces a mean of $127.95 and a standard deviation of $24.03. If the size of this sample is 40, which of the following is an approximate 90 percent confidence interval for the average cost of a repair at this repair shop? (A) $127.95±$4.87 (B) $127.95±$6.25 (C) $127.95±$7.45 (D) $127.95±$30.81 (E) $127.95±$39.53
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