# CCGPS CA 4.3.3 Example 2

Mr. Gray’s students are interested in learning how studying can improve test performance. Mr. Gray provides students with practice problems related to particular tests. The class records the number of practice problems completed and the score on that related test in the table below.
What is the correlation between the number of practice problems completed and the test score?
Is there a causal relationship between the number of practice problems completed and the test score?

- Create a scatter plot of the data.
- Analyze the scatter plot, and describe any relationship between the two events.
- Determine the correlation coefficient.
- Describe the correlation between the two events.
- Consider the causal relationship between the two events. Determine if it is likely that the number of practice problems completed is responsible for increased test scores. Note any other factors that could influence test scores.