The major fault in the one-group pretest-posttest design is that
A) there is no way to test whether participants' performance changed over time.
B) there are no statistics available to test the data this design yields.
C) there is no way to control for demand characteristics.
D) there is no way to examine the effects of history and maturation on the results.

Question

Quizplus · Accepted Answer

The major fault in the one-group pretest-posttest design is that it does not control for external factors such as history and maturation, which can affect the results independently of the experimental manipulation. This design lacks a control group, making it difficult to determine whether changes in the dependent variable are due to the treatment or other external factors.

The Major Fault in the One-Group Pretest-Posttest Design Is That