A company that manufactures drugs to treat heart disease wants to determine if a new drug and exercise can affect cholesterol levels. What are the independent and dependent variables in this proposed study?
a) The dependent variable is exercise; the independent variables are the drug and cholesterol level.
b) The dependent variable is cholesterol level; the independent variables are the drug and exercise.
c) The independent variables are the drug and cholesterol level; the dependent variable is amount of exercise.
d) The dependent variable is the number of heart attacks; the independent variables are the drug, exercise, and cholesterol level.
ANS: b
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