Because the participants who drop out of a longitudinal study are likely to be different in some ways from those who remain until the end of the study
A) the conclusions drawn from longitudinal studies are seldom reliable.
B) the sample that is initially representative becomes increasingly biased over time.
C) there will be a cohort effect upon the final results.
D) attrition will make the sample more representative over time.

Question

Quizplus · Accepted Answer

The statement suggests that there will be a bias in the sample as a result of those who drop out of the longitudinal study, indicating that the sample that was initially representative becomes increasingly biased over time.

Because the Participants Who Drop Out of a Longitudinal Study