Dr Wilhelm Randomly Assigned 50 Depressed Patients (Half Women and Half

Multiple Choice

Dr. Wilhelm randomly assigned 50 depressed patients (half women and half men) to two groups for treatment. One group received medication, and the other received cognitive therapy. Ratings of the depression level of the participants were taken before and after treatment. The gender of the participants in the study is the

A) dependent variable.
B) independent variable.
C) classificatory variable.
D) third variable.