Question: You learned four experimental designs: One - group after - only design, one - group before - after design, two - group after - only

You learned four experimental designs: One-group after-only design, one-group before-after design, two-group after-only design, and two-group before-after design. Choose any two designs and explain how they are conducted and how the treatment effects are computed. Answer the question by using the standard notations (EG, CG, X, O1, O2, O3, O4, and R) to
You learned four experimental designs: One-group after-only design, one-group before-after design,

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