Compute confidence intervals for unknown population mean

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Reference no: EM13239137

In a study of the income of U.S factory workers, a random sample of 125 workers shows a sample mean of $29,000. Assume that the population standard deviation is $4,500.

A) Compute the 90%, 95%, and 99% confidence intervals for the unknown population mean.

B) Briefly discuss what happens to the width of the confidence interval estimate as the confidence level increases. Does this seem reasonable?

Reference no: EM13239137

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