Which of the following threats to external validity occur if the researcher interacts differently with different subjects?
A) reactive arrangements
B) multiple treatment interference
C) experimenter effects
D) pretest sensitization

Question

Quizplus · Accepted Answer

Experimenter effects occur when the researcher's behavior or actions influence the study's outcome. If the researcher interacts differently with different subjects, this could lead to experimenter effects and threaten the study's external validity. Reactive arrangements refer to when subjects alter their behavior simply because they are aware they are being studied. Multiple treatment interference occurs when a subject's response to a treatment becomes influenced by previous treatments they have received. Pretest sensitization refers to changes in a subject's behavior due to being tested multiple times or becoming more familiar with the study protocol. None of these options accurately describe the threat outlined in the question.

Which of the Following Threats to External Validity Occur If