Question

ch 9 in order to investigate treatments for morbid obesity, obese subjects satisfying fairly strict requirements were randomly assigned to one of three groups: (1) gastric bypass surgery, (2) participation in a diet and exercise program, or (3) 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. the response variable is

○ random assignment.

○ the kind of program to which a subject was assigned.

○ the amount of weight lost five years after the study began.

○ gastric bypass surgery.

Explanation:

In a study, the response variable is the outcome being measured or observed. Here, the researchers are observing the amount of weight lost five years after the study began to see the effect of different treatments (the explanatory variable is the kind of program assigned). Random assignment is a method, the kind of program is the explanatory variable, and gastric bypass surgery is one of the treatments. So the response variable is the amount of weight lost five years after the study began.

Answer:

the amount of weight lost five years after the study began.