JWU Statistics Worksheet


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 4040

home theater systems has a mean price of


Assume the population standard deviation is


Construct a 90% confidence interval for the population mean.

The 90% confidence interval is (nothing,nothing).