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A statistician wants to test for the equality of means in two independent samples drawn from normal populations of people enrolled in a diet program. The number of pound lost at the completion of the program data follow: Sample 1 7 9 6 15 7 10 8 12 Sample 2 2 25 9 15 10 18 5 22 27 3 a. Can the statistician conclude at the 5% signicance level that there is no dierence between the two population means? b. Estimate with 95% condence the ratio of the two population variances.
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