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In a random sample of 40 refrigerators, the mean repair cost was $150. Assume the population standard deviation = $15.5. a/ Construct a 99% confidence

In a random sample of 40 refrigerators, the mean repair cost was $150.Assume the population standard deviation = $15.5.

a/ Construct a 99% confidence interval for the population means repair cost.Interpret the results.

b/ Repeat the exercise 1(a), changing the sample size to n = 60. Which confidence interval has better estimate?Why?Explain?

1. Repeat exercise 1(a), using a population standard deviation of = $19.5. Which confidence interval iswider? Explain?

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