Question: Twenty men participated in a weight loss program. Their weight was measured before and after the program. The differences o weight before minus weight after

Twenty men participated in a weight loss program. Their weight was measured before and after the program. The differences o weight before minus weight after the program were computed for all men. The mean difference weight was 2.5 kg with a on standard deviation of differences of 0.5 kg. At the 1% level of significance, was the weight loss program effective

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