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 ______________________.
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
ANS: B, Both variables in the example move in the same direction and, therefore, have a positive correlation.
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