Question 2. (Answer both parts.) A new weight-loss program is tested on 520 adults in New Jersey and on 389 adults in Pennsylvania. In New Jersey, the average weight loss per person is 57 pounds. In Pennsylvania, the average weight loss per person is 13 pounds. The researchers conclude that for some reason this new program is much more effective in New Jersey than in Pennsylvania. If you think the conclusion is valid, suggest an explanation; if you think the conclusion is invalid, suggest a flaw in the study.

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