The possibility that a main effect found in a simple experiment may interact with another variable,
A) may limit the simple experiment's external validity
B) limit the simple experiment's internal validity
C) both a and b
D) neither a nor b

Question

Quizplus · Accepted Answer

An interaction with another variable can limit the external validity of a simple experiment because it suggests that the effect may not generalize across different conditions or populations.

The Possibility That a Main Effect Found in a Simple