Sample mean and the population standard deviation

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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. 

A random sample of 44 gas grills has a mean price of $649.50.  Assume the population standard deviation is $57.10.

The 90% confidence interval is (  ,  )?

The 95% confidence interval is (  ,  )?

What interval is wider?  The 90% confidence interval or the 95% confidence interval?

Reference no: EM132150170

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