Aresearcher 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
a) dependent variable.
b) independent variable.
c) control variable.
d) comparison control.

The answer is B: Independent Variable.

Explanation: The independent variable is the variable that is controlled in a study or research in order to test the effects that it has over the dependent variable.

In this particular study, the dependent variable that is being measured is the test performance of students. The independent variable that is controlled in order to test the effects that is has over said dependent variable is the orange juice.

The answer is B,  the orange Juice is the independent variable.

answer; (r/t) reaction time;