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A Scientist Trying to Test a Theory About the Relationship

Question 127

Multiple Choice

A scientist trying to test a theory about the relationship between people's consumption of alcohol and their longevity would want to hold all of the following variables constant except ____:


A) the amount of alcohol that people in the experimental group consumed.
B) the amount of cigarettes that people in the experimental group smoked.
C) the amount of dietary fat that people in the experimental group consumed.
D) past histories of heart and lung disease.

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