When I look at the number of hours a student sleeps on an average night and the student's overall GPA, I find that the data form an inverted (upside down) U. Students who get too little sleep or too much sleep do poorly whereas those who get about 7-8 hours do well. What kind of correlation should I see?

Question

Quizplus · Accepted Answer

The relationship described is curvilinear, forming an inverted U shape, which means there is no consistent positive or negative correlation across the entire range of data.

When I Look at the Number of Hours a Student