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.

  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.