In Exercise 2, the quadratic model results in R2 = XXXXXXXXXXIdentify the percentage of the variation in Super Bowl points that can be explained by the quadratic model relating the variable of year...

In Exercise 2, the quadratic model results in R2 = 0.255. Identify the percentage of the variation in Super Bowl points that can be explained by the quadratic model relating the variable of year and the variable of points scored. ( Hint: See Example 2.) What does the result suggest about the usefulness of the quadratic model?