12. Losing Weight In a comparison of the mean 1-month weight losses for women aged 20–30 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 a 5.05.

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Diet I Diet II Sample Size n 40 40 Sample Mean X (kg) 4.5 3.6 Sample Variance s 0.89 1.18