Alabama building contracts for a 12- month period (in millions of

     Alabama   Building contracts for a 12- month period (in millions of dollars) are 240,   350, 230, 260, 280, 320, 220, 310, 240, 310, 240 and 230.   a- Compare a three month   moving average forecast with an exponential smoothing   forecast using α = 0.2 which   provides the better forecasts?   b- What is the forecast for   the next month?