The one- group pretest- posttest design may be symbolized as O₁X₂O_2.In this design, a group of test units is measured _. A) once B) twice C) not at all D) none of the above

Name: The one- group pretest- posttest design may be symbolized as O 1 X 2 O 2. In this design, a group of test units is measured _. A) once B) twice C) not at all D) none of the above
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In the one-group pretest-posttest design, the group is measured twice: once before the treatment (O1) and once after the treatment (O2).

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

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