operation management c;ass

. Computes the mad, mape, mse for the twoâand three period moving average models and compare results. Forecasts and actual sales of portable MP3 players at just say music are as follows;
Month Forecast Sales Actual Sales
March 150 170
April 220 229
May 205 192
June 256 241
July 250 238
August 260 210
September 270 225
October 280 179