You are given the sample mean and the population standard deviation. Use this information to construct the90% and95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.

From a random sample of 72 dates, the mean record high daily temperature in a certain city has a mean of 83.18F. Assume the population standard deviation is 15.34F.

The90% confidence interval is (

nothing

,

nothing

).

(Round to two decimal places asneeded.)

The95% confidence interval is (

nothing

,

nothing

).

(Round to two decimal places asneeded.)