What is the only way to determine whether an interaction exists between independent variables?
A) Include both of them in the design
B) Add a third level of an independent variable
C) Add more subjects to the experiment
D) Add a control variable to the experiment

Question

Quizplus · Accepted Answer

The only way to determine whether an interaction exists between independent variables is to include both of them in the design. This means manipulating both independent variables and observing their effects on the dependent variable. Without manipulating both independent variables, it is impossible to determine whether there is an interaction between them.

What Is the Only Way to Determine Whether an Interaction