Anew protein supplement is designed to athletes gain weight. to test this claim, 40 athletes are studied. 20 athletes are given the supplement and the other 20 are given a placebo. there weight is measured each week for 12 weeks. what is the responding or dependent variable?

The responding or dependent variable is the weight gain by athletes

Explanation:

A variable whose effective value or performance is dependent on one or more independent variable is known as dependent variable  

In this experiment, protein supplement is an independent variable as its value is not dependent on any other factor. While , the value of weight gain by athletes is dependent on intake of protein supplement

Hence, the responding or dependent variable is the weight gain by athletes.

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