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 has:
A)four factors.
B)three treatments.
C)two treatments.
D)None of the answer options is correct.

Question

Quizplus · Accepted Answer

The study has three treatments: gastric bypass surgery, participation in a diet and exercise program, or both. There is no mention of any other factors, so the study does not have four factors. Therefore, the best choice is B.

In Order to Investigate Treatments for Morbid Obesity, Obese Subjects