Answer
a. This is a designed experiment because the physicians controlled the assignment of patients suffering from compulsive behavior to different groups.
b. This is a double blind study because neither patients nor physicians know who is in the treatment group and who is in the control group.
Work Step by Step
a. This is a designed experiment because the physicians controlled the assignment of patients suffering from compulsive behavior to different groups.
b. This is a double blind study because neither patients nor physicians know who is in the treatment group and who is in the control group.