Bess has conducted a pretest-posttest control-group study to raise math scores among fifth-grade students who have failed math. She has controlled the potential problem of __________ because she has selected participants for the experimental and control groups from the same pool of extremely low-scoring participants.

Question

Quizplus · Accepted Answer

Statistical regression is controlled because both groups are selected from the same pool of low-scoring participants, minimizing the chance that changes in scores are due to regression toward the mean.

Bess Has Conducted a Pretest-Posttest Control-Group Study to Raise Math