EG: R O₁ X O₂ CG: R O₃ O₄ In the pretest-posttest control group design shown above,selection bias is eliminated by ________. A)design control B)randomization C)matching D)statistical control

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Randomization helps to eliminate selection bias in this design. By randomly assigning participants to either the experimental or control group, there is less chance of certain characteristics or biases being disproportionately represented in one group compared to the other. This increases the internal validity of the study. While design control, matching, and statistical control can also help improve the internal validity of a study, they do not specifically address selection bias in the same way that randomization does.

EG: R O1 X O2 CG: R O3 O4

EG: R O₁ X O₂ CG: R O₃ O₄