question archive When using a sample to estimate the population mean not only is a standard deviation necessary but also must find the standard error of the mean (also known as the standard deviation of x-bar)
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When using a sample to estimate the population mean not only is a standard deviation necessary but also must find the standard error of the mean (also known as the standard deviation of x-bar).
1) Why is it necessary to "adjust" the standard deviation with the standard error of the mean?