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 13.11

11.

10 100
20 95
30 85
40 85
50 80

13.1.11

(a) and (b)

Predicted value
 Residual
()
10 100 99 1
20 95 94 1
30 85 89 –4
40 85 84 1
50 80 79 1

(c) and (d) See Solutions Manual. (e) The scatterplot of the residuals contains an unhealthy pattern, so the regression assumptions are not verified.