TEST stored in Countries, perform a square-root transformation on per capita GDP and develop different regression models by using per capita GDP, square-root of per capita GDP, and population growth as independent variables. Find the most appropriate model.

a. State the regression equation.

b. Interpret the meaning of the coefficient of multiple determination, \(r^{2}\), in this problem.

c. Compute the adjusted \(r^{2}\).

d. Compare your results with those in Problem 15.4. Which model is better? Why?

Problem 15.4

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