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You are given the sample mean and the population standard deviation. Use this information to construct...

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Statistics

You are given the sample mean and the population standarddeviation. Use this information to construct the​ 90% and​ 95%confidence intervals for the population mean. Interpret the resultsand compare the widths of the confidence intervals. If​ convenient,use technology to construct the confidence intervals. A randomsample of 50 home theater systems has a mean price of ​$149.00.Assume the population standard deviation is ​$18.70.

Construct a​ 90% confidence interval for the population mean.The​ 90% confidence interval is ​( _____​, ______​). ​(Round to twodecimal places as​ needed.)

Answer & Explanation Solved by verified expert
4.0 Ratings (459 Votes)
At 90 confidence interval the critical value isz005 1645The 90 confidence interval for population mean is z005 149 1645 187 149 435    See Answer
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