What is the important difference between the between-participants posttest-only design and the flawed non-equivalent posttest-only design?
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 variables

Question

Quizplus · Accepted Answer

The key difference is that the between-participants posttest-only design uses random assignment to create equivalent groups, ensuring that any differences observed are due to the manipulation of the independent variable, not pre-existing differences between the groups. The flawed non-equivalent posttest-only design lacks this random assignment, making it difficult to attribute differences observed to the independent variable confidently.

What Is the Important Difference Between the Between-Participants Posttest-Only Design