Which threat to internal validity is most likely to affect an experiment in which one of the conditions is very unpleasant or demanding?
A) Mortality
B) History
C) Selection
D) Interactions with selection

Question

Quizplus · Accepted Answer

Mortality refers to the dropout of participants from a study, which is more likely if one condition is particularly unpleasant or demanding, leading to biased results.

Which Threat to Internal Validity Is Most Likely to Affect