Quarterly demand of an aircraft spare part during the last two years (in sequence) is 125, 250, 170, 190, 225, 260, 305, and 190. Determine the forecasts for periods 3 to 9 using 2 period moving averages (MA-2) and Exponential smoothing with α = 0.2 (i.e. ES (0.2)). For ES (0.2) calculations, assume that the forecast for period 2 was 150. Compare MAD, MSE and MAPE for the forecasts from period 3 to 8. Which forecasting method has been more accurate?