31 A rescarcher introduces a new exercise propram in the pay chiatric ward of one hospital and uses the Doychiatric ward at another hospital as a no treatment control group. Before the program begins....

31

A rescarcher introduces a new exercise propram in the pay chiatric ward of one hospital and uses the Doychiatric ward at another hospital as a no treatment control group. Before the program begins. the depressed patients in both hospitals are evaluated for heir level of depression. After the program is in Place for six months, the patients are evaluated again and the researcher compares the before and alter scores for the two groups. This research study is classified as

a. correlational

b. experimental

c. quasi-experimental

d. nonexperimental