Question 10.73

10.73 What’s wrong?

For each of the following, explain what is wrong and why.

  1. The slope describes the change in for a unit change in .
  2. The population regression line is .
  3. A 95% confidence interval for the mean response is the same width regardless of .

10.73

(a) and are reversed, the slope describes the change in for a unit change in . (b) The population regression line uses parameters, . (c) This is incorrect, the width of the interval widens the further from .