In a random sample of 13 microwave ovens, the mean repair cost was $80.00 and th

Question

In a random sample of 13 microwave ovens, the mean repair cost was $80.00 and the standard deviation was $15.20. Using the standard normal distribution with the appropriate calculations for a standard deviation that is known, assume the population is normally distributed, find the margin of error and construct a 98% confidence interval for the population mean . A 98% confidence interval using the t-distribution was (687,913). Compare the results. The margin of error of is (Round to two decimal places as needed.)

Explanation / Answer

Confidence interval = (68.7 , 91.3)

Margin of error = (91.3 - 68.7) / 2 = 11.3 (ans)

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