you are interested in whether a group on a weight loss program has lost more weight than the general population. You kno

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you are interested in whether a group on a weight loss program has lost more weight than the general population. You know you equal 0, but you don't know the value of Sigma. You therefore compute the standard error of the mean (SM) to test the hypothesis that your weight loss program results in more of weight than the general population. If your mean weight loss is 8 pounds, with s=4 and n=25, the SM is 0.8. The y-statistic is _____________.