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Confidence interval for the population mean repair cost

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In a random sample of 40 refrigerators, the mean repair cost was $121.00 and the population standard deviation is $15.80. Construct a 90%confidence interval for the population mean repair cost. Interpret the results.

Construct a 90% confidence interval for the population mean repair cost.

The 90%confidence interval is__,___?

Interpret you results. Choose the correct answer below.

A.The confidence interval contains 90% of the mean repair costs.

B.With 90% confidence, it can be said that the confidence interval contains the sample mean repair cost.

C.With 90% confidence, it can be said that the confidence interval contains the true mean repair cost.

Reference no: EM131099723

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