Julie 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 8 hours,her quiz scores improve; as her sleep drops to 5 hours,her quiz scores show a similar decline.Julie realizes that:
A)there is a negative correlation between the number of hours she sleeps and her quiz grades.
B)there is a positive correlation between the number of hours she sleeps and her quiz grades.
C)her low quiz scores are caused by sleep deprivation the night before a quiz.
D)she should sleep about 10 hours a night to ensure 100 percent quiz grades.

Question

Quizplus · Accepted Answer

There is a positive correlation between the number of hours Julie sleeps and her quiz grades. As she sleeps more (approaching 8 hours), her quiz scores improve, and as she sleeps less (dropping to 5 hours), her quiz scores decline. This indicates that getting adequate sleep is important for academic performance. However, it is not accurate to conclude that sleeping 10 hours a night will guarantee a 100% quiz grade, as other factors may also play a role in academic success.

Julie Has Found That the Number of Hours She Sleeps