Camilla wants to know whether studying for more time will improve students’ test scores. Which of the following study designs will best help Camilla to determine whether studying for more hours will lead to higher test scores?
A. Study one student throughout the year to see if their study habits change after he receives a poor grade on his test.
B. Observe students studying in the library, in their dorm rooms, or cramming in the classroom right before the exam.
C. Ask all the students in the class to track the number of hours they spent studying for the exam and their final exam scores.
D. Assign 5 students to study for 1 hour and 5 students to study for 10 hours, and compare test scores between the two groups.
Answer: D
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