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Hypothesis Testing: Mean weight loss

Is the Diet Practical? When 40 people used the Weight Watchers Diet for one year, their mean weight loss was 3.0 lb and the standard deviation was 4.9 lb. Use a 0.01 significance level to test the claim that the mean weight loss is greater than 0 lb. Based on these results, does the diet appear to be effective? Does the diet appear to have practical significance?



Test Statistic [Show procedure.]


Conclusion (i.e. decision) about H0 [reject/fail to reject]

Final Conclusion on the claim [Use the wording in Figure 8-7, page 403.]

Solution Summary

The solution provides step by step method for the calculation of testing of hypothesis. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.