In a study reported in the American Journal of Clinical Nutrition, young men who drank fat-free milk after exercising gained 40% more muscle mass than those who drank a soy beverage after exercising.  Fat-free milk drinkers gained 60% more muscle mass than those who consumed a sweetened sports drink.    What is the response variable in this study? What is the explanatory variable in this study? What is the role – type classification of the variables in this study?

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.