Selection differences are less likely to occur when researchers:
A)use pre-existing groups found in natural settings.
B)randomly assign participants to groups.
C)allow participants to assign themselves to groups.
D)use nonequivalent control group design.

Question

Quizplus · Accepted Answer

Random assignment controls for selection differences because it ensures that each participant has an equal chance of being placed in either group. Pre-existing groups found in natural settings and self-assignment may lead to selection bias. The nonequivalent control group design also runs the risk of selection differences because the groups are not created through random assignment.

Selection Differences Are Less Likely to Occur When Researchers