What is the important difference between the posttest-only control-group design and the posttest-only design with nonequivalent groups?
A) The former uses random assignment of participants to groups
B) The former uses two groups of participants
C) The latter involves testing participants twice
D) The latter does not manipulate an independent variable

Question

Quizplus · Accepted Answer

The posttest-only control-group design uses random assignment to create equivalent groups, whereas the posttest-only design with nonequivalent groups does not use random assignment, leading to potential differences between groups.

What Is the Important Difference Between the Posttest-Only Control-Group Design