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 randomly assigned the students to the experimental and control groups.

Question

Quizplus · Accepted Answer

Random assignment helps control the potential problem of selection bias by ensuring that each participant has an equal chance of being placed in either the experimental or control group, thus making the groups comparable.

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