Maddie Does an Experiment to Test Whether Exercising Gives Her

Multiple Choice

Maddie does an experiment to test whether exercising gives her more energy. She spends one week exercising every day, and one week not exercising at all. For both weeks, she rates her energy level at the end of the day on a scale of 1-10. In her study, the independent variable is

A) her daily rating
B) whether or not she exercises on a given day
C) her average daily rating for each week
D) Maddie
E) none of the above are independent variables