For Exercises 7–14, you are given the regression equation.

  1. Calculate the predicted values.
  2. Compute the residuals.
  3. Construct a scatterplot of the residuals versus the predicted values.
  4. Use technology to construct a normal probability plot of the residuals.
  5. Verify that the regression assumptions are valid.

Question 13.8

8.

0 10
5 20
10 45
15 50
20 75