A sample of 20 observations is selected from a normal population. The sample standard deviation is 26.25,
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A sample of 20 observations is selected from a normal population. The sample standard deviation is 26.25, and the sample mean is 75.
a. Determine the standard error of the mean.
b. Determine the 90% confidence interval for the population mean.
c. If you wanted a wider interval, would you increase or decrease the confidence level?
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Related Book For 
Basic Statistics For Business & Economics
ISBN: 9781259268939
6th Canadian Edition
Authors: Douglas A. Lind, William G Marchal, Samuel A. Wathen, Carol Ann Waite
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