A Group of Physicians Tests a New Analgesic on Their

Multiple Choice

A group of physicians tests a new analgesic on their patients with chronic pain problems. They obtain patient ratings of pain, administer the new drug for a week, and then obtain pain ratings again. They find that pain ratings are down 10 points at their second observation. This is an example of which experimental design.

A) one-group posttest-only design
B) one-group pretest-posttest design
C) non-equivalent posttest-only design
D) non-equivalent before-after pretest-posttest) design