In order to investigate treatments for morbid obesity, obese subjects satisfying fairly strict requirements were randomly assigned to one of three treatment groups: (1) gastric bypass surgery, (2) participation in a diet and exercise program, or (3) both gastric bypass surgery and participation in a diet and exercise program. Researchers observed the amount of weight lost five years after the study began. This study uses the principles of:
A)randomization.
B)confounding.
C)blocking.
D)All of the answer options are correct.

Question

Quizplus · Accepted Answer

The study uses randomization, as subjects were randomly assigned to different treatment groups. Confounding and blocking were not explicitly mentioned in the scenario.

In Order to Investigate Treatments for Morbid Obesity, Obese Subjects