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Research Design and Control

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I am conducting an experiment concerning review for exams and have concluded that students who accessed an online video review score much higher on an exam.

Are there rival causes that could also explain why students who accessed the video review scored higher on the exam than students that did not access it? How could each rival cause explain the video review-exam score relationship?

If I want to improve this experiment what procedures would you recommend that would help isolate the effect of video review on exam scores and why?

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This solution discusses research designs and control.

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One of the possible rival causes as to why students who accessed the video review scored higher on the exam than students that did not access it, could be that the students who did not access it did not study at all. This cause would explain the video review exam score relationship as being caused by the lack of efforts by those ...

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