Which of the following best illustrates why would we expect a reduction of error variance in a within-subjects design?

Question

Quizplus · Accepted Answer

Within-subjects design involves testing the same subjects in different conditions or situations. In this scenario, if Stephen's behavior is more similar in situations A, B, and C, it will reduce the error variance because any differences observed between his behaviors in these situations can be attributed to the different conditions rather than individual differences between the subjects. Conversely, if behaviors of different subjects in different situations are more similar (Option B and C), it can lead to higher error variance because it becomes difficult to conclude whether the observed differences are due to the different conditions or individual differences between the subjects. Option D is not relevant to the explanation of error variance in a within-subjects design.

Which of the Following Best Illustrates Why Would We Expect