The main problem associated with subject attrition during the course of a study is that
A)groups initially created to be equivalent may no longer be equivalent.
B)the group with the most participants remaining at the end of a study will likely have higher posttest scores.
C)the researcher can no longer use statistical analysis to understand the results.
D)regression to the mean on the dependent variable measure is likely.

Question

Quizplus · Accepted Answer

Subject attrition can lead to the groups no longer being equivalent, as individuals may drop out for different reasons (e.g. illness, lack of motivation). As a result, the remaining participants in each group may differ in important ways that impact the study's results.

The Main Problem Associated with Subject Attrition During the Course