Julie finds 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

The situation above concludes that there is a direct relationship between the number of sleep hours of Julie and her performance on quizzes. The relationship is directly proportional. This means that when sleep hours decrease so as the quiz score while it increases on the hand when sleep hours is greater.