(All Steps) Is the Diet Practical? When 40 people used the Weight Watchers diet for one year, their mean weight loss was 3.01 lb . Assume that the standard
Question: Is the Diet Practical? When 40 people used the Weight Watchers diet for one year, their mean weight loss was \(3.01 \mathrm{lb}\) . Assume that the standard deviation of all such weight changes is \(\sigma=4.9 \mathrm{lb}\) and use 0.01 significance level to cost the claim that the mean weight loss is greater than 0. Based on these results, docs the diet appear to be effective? Does the diet appear to have practical significance?
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