9.69 Losing Weight In a comparison of the mean 1-month weight losses for women aged 20 to 30 years, these sample data were obtained for each of two diets:

Do the data provide sufficient evidence to indicate that diet I produces a greater mean weight loss than diet II? Use = 0.05.

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Diet I Diet II Sample size n 40 40 Sample mean x 4.54 kg 3.63 kg Sample variance s 1.95 kg 2.59 kg