Students who completed a study skills course raised their grade point averages.Can we conclude that the course caused their improvement?
A)Yes, because the scientific data was collected.
B)Yes, because a negative correlation exists between these students' grade point averages before and after taking the course.
C)Yes, because the course resulted in a self-fulfilling prophecy.
D)No, because there was no control group.

Question

Quizplus · Accepted Answer

Without a control group, we cannot conclude that the study skills course caused the improvement in grade point averages. Other factors may have played a role in the students' improvement. A control group would have allowed for a comparison between students who took the course and those who did not, which would provide a more accurate measure of the effectiveness of the course.

Students Who Completed a Study Skills Course Raised Their Grade