# Example 1

- Author:
- Walch Education

- Topic:
- Correlation, Function Graph, Scatter Plot

An education research team is interested in determining if there is a relationship between a student’s vocabulary and how frequently the student reads books. The team gives 20 students a 100-question vocabulary test, and asks students to record how many books they read in the past year. The results are in the following table. Is there a linear relationship between the number of books read and test scores? Use the correlation coefficient,

*r*, to explain your answer.- Create a scatter plot of the data.
- Describe the relationship between the data using the graphical representation.
- Calculate the correlation coefficient on your graphing calculator.
- Use the correlation coefficient to describe the strength of the relationship between the data.