Question

You are given the sample mean and the sample standard deviation. Use this information to construct the​ 90% and​ 95% confidence intervals for the population mean. Which interval is​ wider? If​ convenient, use technology to construct the confidence intervals.

A random sample of

3131

gas grills has a mean price of

​$625.50625.50

and a standard deviation of

​$59.3059.30.

The​ 90% confidence interval is

left parenthesis nothing comma nothing right parenthesis .607.981,643.019.

​(Round to one decimal place as​ needed.)The​ 95% confidence interval is

left parenthesis nothing comma nothing right parenthesis .,.

​(Round to one decimal place as​ needed.)

Answer 1

The​ 90% confidence interval is (607.4,643.6)

The 95% confidence interval is (603.7,647.3)

Correct the confidence interval for 90%, you did it wrong. Thank you.