You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals.

A random sample of

35

home theater systems has a mean price of

$138.00.

Assume the population standard deviation is

$17.30.

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Part 1

Construct a 90% confidence interval for the population mean.

The 90% confidence interval is

(enter your response here,enter your response here).

(Round to two decimal places as needed.)