Refer to the previous exercise. In view of these assumptions, indicate why such a model would or

Question:

Refer to the previous exercise. In view of these assumptions, indicate why such a model would or would not be good in the following situations:
a. x = year (from 1900 to 2005), y = percentage unemployed workers in the United States.
b. x = age of subject, y = subject’s annual medical expenses.
c. x = per capita income, y = life expectancy, for nations.