### Home > GB8I > Chapter 6 Unit 7 > Lesson INT1: 6.1.1 > Problem 6-9

A researcher wanted to see if there was an association between the number of hours spent watching TV and students’ grade point averages. He found

*r* represents the correlation coefficient.

Review the Math Notes box in section 4.2.4

Since is negative, there is a

**decreasing association**(the slope is negative) between the hours spent watching TV and GPA.

The closer

*is to*

**represents the percentage of variability that can be attributed to the dependent variable.** -squared

Therefore, there is a good, but not great association between these two variables, meaning as the number of TV watching hours increases, the GPA of the student tends to decrease.

Since

-squared

Any other variability should be attributed to other factors.