(ob. 6) The posttest-only control-group design has an advantage over the pretest-posttest control-group design when
A) the total sample that is to be assigned to the experimental and control groups is small.
B) the researchers are interested in forming subgroups within the experimental and control groups.
C) there is a possibility that administration of a pretest will affect the experimental treatment.
D) there is likely to be differential attrition during the course of the experiment.

Question

Quizplus · Accepted Answer

The posttest-only control-group design avoids the potential issue of the pretest influencing the outcomes of the experiment, which can occur if the pretest sensitizes participants to the treatment or alters their behavior in some way.

(Ob 6) the Posttest-Only Control-Group Design Has an Advantage Over