Which of the following threats to external validity is the most difficult to deal with as a researcher?
A) Multiple-treatment interference
B) Reactive arrangements
C) Demand characteristics
D) Participant-related threats

Question

Quizplus · Accepted Answer

Participant-related threats are often the most difficult to control because they involve individual differences and variability among participants that can affect the generalizability of the study's findings. These differences can be complex and unpredictable, making it challenging to account for them fully in research design.

Which of the Following Threats to External Validity Is the Most