Question

In order to investigate treatments for morbid obesity, obese subjects satisfying fairly strict requirements were randomly assigned to one of three groups: gastric bypass surgery; participation in a diet and exercise program; or both gastric bypass surgery and participation in the diet and exercise program. Researchers carefully 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 above

Answer 1

The right answer is B.

Explanation:

This study doesn´t talk about obesity factors, therefore A. is wrong.

The objective of this study is to determine effective treatments for morbid obesity. For that purpose, the investigators set 3 sample groups of people to investigate treatments, giving each one of them a different treatment. All of them are different between them (the third group, by having a combination of the treatment of the first and the second group, has a different treatment). Therefore this study has three treatments. (B. is correct and C. is incorrect).

Because B. is correct, D. can´t be it.