A psychologist wants to test the hypothesis that therapy dog visitations following surgery will shorten the recovery time for surgical patients when compared to recovery times of patients who received no therapy dog visitation following surgery. Half of the patients are randomly assigned to therapy dog visits following surgery, and the other half receives no therapy dog visits. The number of days until recovery is noted for each patient. Identify the FOUR following components for EACH of the following experiments listed below: Independent Variable Dependent Variable Control Group Experimental Group