Using the mobile phone subscriptions per 100 inhabitants of Sweden from 2000 to 2016.

a. perform a residual analysis for each model.

b. compute the standard error of the estimate \(\left(S_{Y X}\right)\) for each model.

c. compute the \(M A D\) for each model.

d. On the basis of (a) through (c) and the principle of parsimony, which forecasting model would you select? Discuss. e. Forecast the mobile phone subscriptions for 2019 based on the model selected in (d).