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 60 home theater systems has a mean price of $148.00. Assume the population standard deviation is $18.60. Construct a 90% confidence interval for the population mean.
The 90% confidence interval is (___,___)
(Round to two decimal places as needed.)