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In a random sample of 16 laptop computers, the mean repair cost was $120 with a...

In a random sample of 16 laptop computers, the mean repair cost was $120 with a sample standard deviation of $31.50. Which of the following is a 90% confidence interval for the population mean repair cost?

a) (107.05, 132.95)

b) (106.19, 133.81)

c) (103.22, 136.78)

d) none of the above

Math   Statistics-And-Probability   
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d) None of the above

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