you are given the sample mean and the sample standard deviation. use the info to

Question

you are given the sample mean and the sample standard deviation. use the info to construct the 90% and the 95% confidenc intervals for the population mean. interpret the results and compare teh widths of the confidence intervals. if convenient use technology to construct
A random sample of 45 hom theater systems has a mean price of 120.00 and a standard deviation of 18.70
construct the 90% confidence interval fo rthe population mean
the 90% confidence interval is _______ _______ round to two decimal places

Explanation / Answer

120+/-1.64*18.70/sqrt(45) =( 115.43, 124.57) The width of the confidence interval is 9.14 We are 90% confident that over a large number of samples, the mean will be in this interval

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