Suppose the average weight loss for someone on a diet (in the population) is 15 pounds. A sample of 18 adults, enrolled in Smart Start Weight Program have a mean weight loss of 15.83 with a standard...

Suppose the average weight loss for someone on a diet (in the population) is 15 pounds. A sample of 18 adults, enrolled in Smart Start Weight Program have a mean weight loss of 15.83 with a standard deviation of 4 pounds. Does participation in the Smart Start Weight problem make a difference in weight loss? Use an alpha of .05 and a two-tailed test.