# Correlation and type of relationship

- Author:
- Mathguru, Walch Education

- Topic:
- Correlation

Caitlyn thinks that there may be a relationship between class size and student performance on standardized tests. She tracks the average test performance of students from 20 different classes, and notes the number of students in each class in the table below.
Is there a linear relationship between class size and average test score?
Use the correlation coefficient,

*r*, to explain your answer.