In a random sample of 60 computers, the mean repair cost was $150….

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?
could you please help me with a step by step process? I keep messing up somewhere.

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