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'roblem 11.6 16 professional marathon runners participated in a 3-month training program which included one hour of swimming three times a week. The best personal
'roblem 11.6 16 professional marathon runners participated in a 3-month training program which included one hour of swimming three times a week. The best personal time (BPT) in minutes for a 5 km run of these athletes was recorded, before and after the training program. The data is summarized in the following table: BPT Before BPT After Difference (d = I - y) 1.7 1.6 Mean Standard Deviation Using this data, can we say that integrating swimming into the training practice of professional runners improves their BPT? Use a test of hypotheses of level a = 0.005. Assume that variables X, Y and D are normally distributed, and the variables X and Y have the same variances
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