Type of correlation
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 table below. 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.
- Use the correlation coefficient to describe the strength of the relationship between the data.