The main problem associated with subject attrition during the course of a study is that
A) regression toward the mean on the dependent variable measure is likely.
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) groups initially created to be equivalent may no longer be equivalent.

Question

Quizplus · Accepted Answer

Subject attrition can cause groups that were initially created to be equivalent to no longer be equivalent. This can create bias and invalidity in the results of the study. The other options may be potential issues associated with subject attrition, but they are not the main problem.

The Main Problem Associated with Subject Attrition During the Course