Using more than two levels of an independent variable can
A) increase your study's external validity
B) increase the chances that your study will find a significant effect
C) both a and b
D) neither a nor b

Question

Quizplus · Accepted Answer

Using more than two levels of an independent variable can increase external validity by providing a more comprehensive understanding of the variable's effects. It can also increase the chances of finding a significant effect by allowing for the detection of non-linear relationships.

Using More Than Two Levels of an Independent Variable Can