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Ten families are randomly selected and their daily water usage (in gallons) before and after viewing a conservation video is recorded. Compute the mean of

Ten families are randomly selected and their daily water usage (in gallons) before and after viewing a conservation video is recorded. Compute the mean of the difference of the "before" minus the "after" times. Before 33 33 38 33 35 35 40 40 40 31 After 34 28 25 28 35 33 31 28 35 33

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