Susan has twelve subjects drop out of her study. Which threat to internal validity must she consider?
A) mortality
B) history
C) selection
D) randomization

Question

Quizplus · Accepted Answer

Mortality refers to the loss of participants during a study, which can result in a biased sample and threaten the internal validity of the study. In this case, with twelve subjects dropping out, Susan must consider the potential impact of this mortality on her results.

Susan Has Twelve Subjects Drop Out of Her Study