you are given the sample mean and the population standard deviation. use this information to construct the 90% 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 50 home theatee systems has a mean proce of $123.00. assume the population standard deviation is $18.60

construct a 90% confidence interval for the population mean.

the 90% confidence interval is ( , )