In the pretest-posttest control group design shown above, selection bias is eliminated by ________.
A)design control
B)randomization
C)matching
D)statistical control

Question

In the pretest-posttest control group design shown above, selection bias is eliminated by ________.
A)design control 
B)randomization 
C)matching 
D)statistical control

Quizplus · Accepted Answer

Randomization is used to eliminate selection bias in the pretest-posttest control group design. Randomization ensures that individuals are assigned to the intervention and control groups in a way that is independent of any other characteristics or factors that may be associated with the outcomes being measured. This helps to ensure that any differences observed between the groups are due to the intervention being tested, rather than any other factors that may be related to the selection of participants into the groups. Design control, matching, and statistical control are also important methods for reducing bias in research studies, but they are not specifically designed to address selection bias in this particular design.

In the Pretest-Posttest Control Group Design Shown Above, Selection Bias