If people who drop out of study are systematically different from those who stay, we have which threat to validity?
A) selection
B) mortality
C) regression to the mean
D) maturation

Question

Quizplus · Accepted Answer

Mortality refers to the loss of participants from a study, and when those who drop out are different from those who stay, it can lead to biased results. This is a threat to internal validity as it may impact the generalizability of the findings. Selection bias refers to differences in groups at the outset of the study, regression to the mean refers to extreme scores becoming less extreme over time, and maturation refers to developmental changes that occur naturally over time. While these threats may also impact the validity of a study, they are not directly related to the issue of dropouts.

If People Who Drop Out of Study Are Systematically Different