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Question: to study the efficacy of a diet five peoples weights...

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To study the efficacy of a diet, five peoples weights were recorded before they started the diet and six months later. These are the results: Before 80 70 65 95 100 After 72 69 67 81 88 Difference 8 -2 14 12 a) Test the hypothesis that the diet is effective and promotes weight loss. b) Obtain a 95% confidence interval for the weight loss.

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