In order to apply the law of the single significant independent variable to a study, a researcher should
a. choose a single test for the dependent variable.
b. determine which single test is most related to the independent variable by using several tests as possible dependent variable.
c. determine which single variable makes the most difference by varying the independent variable in many different ways.
d. establish two groups that are as alike as possible, except one is exposed to the independent variable while the other is not.
D
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