In a random sample of 60 computers, the mean repair cost was $150. Assume the population standard
deviation is $36.
a)Construct the 99% confidence interval for the population mean repair cost.
b)If the level of confidence was lowered to 95%, what will be the effect on the confidence interval?

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The Answer of In a random sample of 60 computers, the mean repair cost was $150. Assume the population standard
deviation is $36.
a)Construct the 99% confidence interval for the population mean repair cost.
b)If the level of confidence was lowered to 95%, what will be the effect on the confidence interval?

In a Random Sample of 60 Computers, the Mean Repair