Find the correlation coefficient, r, of the data described below. Stanley isn't getting enough sleep and suspects it's due to playing too many video games before bed. To find out, he decided to track how much time he spends gaming. Over several days, Stanley recorded how many hours of sleep he had gotten each night, x, as well as how many hours he had spent playing video games before bed, y.

Question

Hours of video games Hours of sleep
0.4 8
0.4 4
1.0 6
1.5 9
2.5 9
3.9 4

1. 0.8
2. -0.1
3. 0.7
4. -0.9

Answer 1

The correlation coefficient, r, is 0.7.

Therefore, the correct answer is:
3. 0.7