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

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Quizplus · Accepted Answer

The drug dosage (none versus peak dose) is the independent variable because it is the variable being manipulated by the researchers in order to measure its effect on the men's erectile dysfunction. The dependent variable is not stated in the question, as it would be the outcome being measured (such as frequency or duration of erections). The confounding variable is any other variable that could potentially affect the outcome and needs to be controlled for in the study. The standard deviation is a measure of variability within a sample or population and is not relevant to the variables in this study.

In an Experimental Study, Men with Erectile Dysfunction Received Either