You used per capita GDP and population growth rate to predict the mean subjective wellbeing (SWB) of

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You used per capita GDP and population growth rate to predict the mean subjective wellbeing (SWB) of countries (stored in Countries ).

a. Recall the same multiple regression model (SWB is the dependent variable and per capita GDP and population growth rate are the independent variables).

b. Add quadratic term for population growth rate.

c. Which model is better, the one in (a) or (b)?

d. What conclusion can you reach concerning the relationship between SWB and population growth rate and per capita GDP?

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