(Answered) What references should i look into to help answer this

Economics

What references should I look into to help answer this question: TRUSTING THE RESULTS: If you were to read the results of a study showing that daily use of a certain exercise machine resulted in an average 10-pound weight loss, what more would you want to know about the numbers in addition to the average? (Hint: Do you think everyone who used the machine lost 10 pounds?)

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