Dr Lasagna Tests a New Diet

Dr. Lasagna tests a new diet. Overweight adults are weighed and placed into one of two groups so that the weight of the groups is equal to start with. One group of adults is given the new diet and the other is placed on a waiting list. After three months, Dr. Lasagna observes that the group on the new diet weighs less. In this example, the independent variable is:

A) the experimental group
B) the control (or comparison) group
C) the weight of the adults
D) whether the adults get the new diet

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