6. The annual population of Afghanistan is available in the global economy data set. a. Plot the data and comment on its features. Can you observe the effect of the Soviet- Afghan war? b. Fit a linear trend model and compare this to a piecewise linear trend model with knots at 1980 and 1989. c. Generate forecasts from these two models for the five years after the end of the data, and comment on the results.

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