When 40 people used the atkins diet for one year their mean, Ask an Expert

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When 40 people used the atkins diet for one year, their mean weight change was -2.1 lb (based on data from "Comparison of the Atkins, Ornish, Weight Watchers, and Zone diets for Weight Loss and heart Disease Reduction," by Dansinger, et al., Journal of the america medical association, Vol. 293, No. 1). Assume that the standard deviation of all such weight changes is 4.8 lb. and use a 0.05 significance level to test the claim that the mean weight change is less than 0. Based on these results, does the diet appear to be effective? Does the mean weight appear to be substantial enough to justify the special diet?

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