To evaluate the effect of the treatment in a pretest,posttest control group design,_____ is calculated.
A) (O2-O1) - (O4-O3)
B) O1-O3
C) O4-O3
D) O2-O3
E) O4-O2

Question

Quizplus · Accepted Answer

To evaluate the effect of the treatment in a pretest-posttest control group design, we need to calculate the difference between the posttest and pretest scores of the treatment group (O2-O1) and the control group (O4-O3). The difference between the two groups should then be calculated by subtracting the control group's score from the treatment group's score, which is represented by (O2-O1) - (O4-O3), also known as the "Net Treatment Effect". This is the formula for option A.

To Evaluate the Effect of the Treatment in a Pretest,posttest