<p>“Yes, indeed! But usually, students with scores of 5 do not repeat the course.”</p>
<p>True, but isn’t the finding of the study relevant because it did control the sample by including students who DID repeat the course?</p>
<p>“And in a not-yet-published study of 465 college students nationwide who had taken both an AP science exam and the corresponding introductory science course …”</p>