Which of the following is considered LEAST damaging to the validity of experimental design?
A) not using a control group
B) not using a pretest
C) not ruling out bias when assigning people to treatment and control groups
D) not using a posttest

Question

Quizplus · Accepted Answer

Not using a pretest is considered least damaging because it does not necessarily affect the ability to determine the effect of the treatment, as long as there is a control group and random assignment.

Which of the Following Is Considered LEAST Damaging to the Validity