Once stakeholders agree that random assignment to groups will be permitted, it is crucial that
A) the evaluator periodically monitor the outcome variables.
B) stakeholders be permitted to make the actual group assignments.
C) different rates of attrition among groups not be permitted to introduce bias.
D) regression to the mean be carefully examined.

Question

Quizplus · Accepted Answer

Different rates of attrition among groups can introduce bias, affecting the validity of the study's results. It is crucial to ensure that attrition does not differ significantly between groups to maintain the integrity of the random assignment.

Once Stakeholders Agree That Random Assignment to Groups Will Be