Which of the following is a threat to the internal validity of an experiment using a repeated measures design?
A) instrumentation effect
B) redundancy effect
C) cohort effect
D) attrition effect

Question

Quizplus · Accepted Answer

In a repeated measures design, the instrumentation effect is a threat to internal validity because changes in the measurement tools or procedures over time can affect the results.

Which of the Following Is a Threat to the Internal