Which of the following threats to external validity happens when subjects discover the experiment's purpose?
A) reactive arrangements
B) multiple treatment interference
C) experimenter effects
D) pretest sensitization

Question

Quizplus · Accepted Answer

Reactive arrangements occur when participants alter their behavior because they are aware they are being studied, which can happen if they discover the experiment's purpose. This awareness can lead to changes in behavior that would not occur outside the experimental setting, thus threatening the external validity of the findings.

Which of the Following Threats to External Validity Happens When