The one-group pretest-posttest design may be symbolized as O1 X2 O2.In this design,a group of test units is measured ________.
A) once
B) twice
C) not at all
D) none of the above

Question

Quizplus · Accepted Answer

In the one-group pretest-posttest design, the group of test units is measured twice - once before (pretest) and once after (posttest) the introduction of an intervention or treatment. Therefore, the symbolization O1 X2 O2 represents the pretest (O1), intervention (X), and posttest (O2) measurements.

The One-Group Pretest-Posttest Design May Be Symbolized as O1 X2