If a researcher believes that a nonmonotonic relationship may exist between two variables, he or she would need to:
A)manipulate two or more independent variables.
B)have a stronger manipulation of the dependent variable.
C)include more than two levels of the independent variable.
D)measure more than one dependent variable.

Question

Quizplus · Accepted Answer

Including more than two levels of the independent variable allows the researcher to observe the shape of the relationship between the variables, which is necessary to identify nonmonotonic relationships (relationships that change direction across the levels of the independent variable).

If a Researcher Believes That a Nonmonotonic Relationship May Exist