In an experimental study,men with erectile disorder received either Viagra or a placebo.In this study,the drug dosage (none versus peak dosage)was the

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The drug dosage (none versus peak dosage) is the independent variable because it is manipulated by the experimenter to see its effect on men with erectile disorder. The dependent variable would be the outcome of interest, such as improvement in erectile function. Confounding variables are other factors that could influence the outcome but are not of interest in this study, and a random sample is not relevant to this experimental design.

In an Experimental Study,men with Erectile Disorder Received Either Viagra