To test the effect of a new teaching procedure, a professor asks some of her students to volunteer to enter an experimental section of the course. The experimental section does better than the standard section. There is a strong possibility that this result may be due to ________ .
A) testing
B) regression
C) selection
D) mortality

Question

Quizplus · Accepted Answer

The result may be due to selection bias, as the students who volunteered for the experimental section might have been more motivated or had other characteristics that contributed to their better performance, rather than the teaching procedure itself.

To Test the Effect of a New Teaching Procedure, a Professor