Janie has found that the number of hours she sleeps each night is related to the scores she receives on quizzes the next day. As her sleep approaches eight hours, her quiz scores improve; as her sleep drops to five hours, her quiz scores show a similar decline. Janie realizes that:

Question

Quizplus · Accepted Answer

The passage states that as Janie's sleep approaches eight hours, her quiz scores improve, and as her sleep drops to five hours, her quiz scores show a similar decline. This indicates that there is a positive correlation between the number of hours she sleeps and her quiz grades. Option A is incorrect because the passage does not provide any evidence that low quiz scores are caused solely by sleep deprivation. Option B is incorrect because it is not necessary to sleep for 10 hours to receive 100% quiz grades. Option C is incorrect because there is no information in the passage to suggest that worrying about low quiz scores causes Janie to have insomnia.

Janie Has Found That the Number of Hours She Sleeps