Julie noticed 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

Question

Quizplus · Accepted Answer

There is a positive correlation between the number of hours Julie sleeps and her quiz grades, as her scores improve with more sleep and decline with less sleep. However, it is not necessarily true that sleeping more than 8 hours or 10 hours will guarantee perfect quiz grades, and it is not clear whether sleep deprivation is the sole cause of low quiz scores.

Julie Noticed That the Number of Hours She Sleeps Each