DEPRESSION STUDY INFO: A sample of 40 individuals is receiving services for depression in an outpatient clinic. The patients are randomly assigned to a treatment and a control condition. The treatment group patients will receive an experimental antidepressant medication while the control group will receive a placebo inert pill. Symptoms of depression using the Beck Depression Inventory (BDI) are compared across the two groups of patients after 8 weeks of treatment. Higher scores represent more depression. Treatment Group Control Group Mean 29.400 33.750 Variance 8.884 14.724 Group Size 20 20 Question 9 1 pts What is the independent variable in this research problem? O Beck Depression Inventory O depressive symptoms O treatment condition O experimental antidepressant O patients with depression