If students who complete 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 to compare against those who took the study skills course, it's impossible to definitively conclude that the course caused the improvement in grade point averages. Other factors could have contributed to the change.

If Students Who Complete a Study Skills Course Raised Their