1. Calculate the regression of income on grade-point average in the example described in this chapter and compare it with the regression of grade-point average on income. Why are the two results different?
2. Assume that least-squares estimates are obtained for the relationship Y = a + b X. After the work is completed, it is decided to multiply the units of the X variable by a factor of 10. What will happen to the resulting least-squares slope and intercept?