In the posttest- only control group design, the treatment effect (TE) is obtained by . A) TE = O₁ B) TE = (O₁- O₂) _-(O₃- O₄) C) TE = O₁- O₂ D) TE = (O₂- O₁) _-(O₄- O₃)

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In a posttest-only control group design, the treatment effect is calculated by comparing the posttest scores of the treatment group (O1) and the control group (O2), hence TE = O1 - O2.

In the Posttest- Only Control Group Design, the Treatment Effect