Construct the 99% confidence interval for the population mean repair cost. (b) If the level of confidence was lowered to 90%, what will be the effect on the confidence interval?

Construct the 99% confidence interval for the population mean repair cost. (b) If the level of confidence was lowered to 90%, what will be the effect on the confidence interval?

In a random sample of 60 computers, the mean repair cost was $150 with a standard Deviation of $36. (a) Construct the 99% confidence interval for the population mean repair cost. (b) If the level of confidence was lowered to 90%, what will be the effect on the confidence interval?


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