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 following table. 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?
  1. Create a scatter plot of the data.
  2. Analyze the scatter plot, and describe any relationship between the two events.
  3. Find the correlation coefficient using a graphing calculator.
  4. Describe the correlation between the two events.
  5. Consider the causal relationship between the two events.
This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information on their resources.