What are the two major threats to internal validity in within-subjects experiments?
A) Individual differences and variance
B) Individual differences and environmental variables
C) Time-related variables and individual differences
D) Environmental variables and time-related variables

Question

Quizplus · Accepted Answer

In within-subjects experiments, environmental variables and time-related variables are major threats to internal validity because they can introduce confounding factors that affect the results.

What Are the Two Major Threats to Internal Validity in Within-Subjects