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 13.7

7.

1 15
2 20
3 20
4 25
5 25

13.1.7

(a) and (b)

Predicted value
 Residual
()
1 15 16 –1
2 20 18.5 1.5
3 20 21 –1
4 25 23.5 1.5
5 25 26 –1

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