For Exercises 2.44 and 2.45, see page 82; for 2.46, see page 84; for 2.47, see page 86; for 2.48 and 2.49, see page 88; for 2.50, see page 90; for 2.51, see page 90; for 2.52, see page 91; and for 2.53, see page 94.

Question 2.68

2.68 Carbohydrates and alcohol in beer revisited

Refer to Exercise 2.65. The data that you used to compute the least-squares regression line includes a beer with a very low alcohol content that might be considered to be an outlier.

beer

  1. Remove this case and recompute the least-squares regression line.
  2. Make a graph of the regression lines with and without this case.
  3. Do you think that this case is influential? Explain your answer.