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 there is a _____ correlation between her hours of sleep and her grades.
A)negative
B)positive
C)neutral
D)causative

Question

Quizplus · Accepted Answer

Both variables in the example move in the same direction (down)and, therefore, have a positive correlation.

Julie Finds That the Number of Hours She Sleeps Each