Pablo gives a racism scale to participants, then gives a half-hour lecture on racism, and then gives participants the racism scale again. Which threat to external validity should Pablo be most concerned about?
A) Multiple-treatment interference
B) Interaction of testing and treatment
C) Interaction of selection and treatment
D) Statistical regression

Question

Quizplus · Accepted Answer

The interaction of testing and treatment is a threat to external validity because the pre-test may sensitize participants to the treatment, affecting their responses on the post-test.

Pablo Gives a Racism Scale to Participants, Then Gives a Half-Hour