A researcher is interested in studying the effect of orange juice on test performance. She will evaluate the test performance of students who drink the juice a half-hour before the test against the performance of students who receive nothing to drink before the test. The groups are equivalent in terms of demographics, intelligence, and prior college classes. In this example, the orange juice would be the

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The orange juice is the experimental variable, as it is the variable being manipulated and tested to determine its effect on test performance. The control variable would be any other factors that could impact test performance (such as the difficulty of the test or the time limit), which would be kept constant between the two groups. The experimental control and comparison control are not relevant to this scenario.

A Researcher Is Interested in Studying the Effect of Orange