Dunn et al. (2005) conducted an experiment of the relationship between exercise and depression. Participants were randomly assigned to either a low or a high intensity workout regime. Some were assigned to work out 3 days a week, while other participants worked out 5 days a week. Identify the independent variable(s) in this study.
A. depression
B. the amount of exercise and the frequency of exercise
C. energy condition
D. the participants' interest in exercise and health conditions
Answer: B
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