Show all your work when answering these questions. A record of the sales data is as follows: Year Sales 1 $439 2 440 3 455 4 457 5 481 6 492 7 505 I a) Assume alpha=0.25 and forecast for year 1 is 420. Calculate the forecast for the years 2 through 8 using exponential smoothing model. b) Calculate the mean squared error (MSE) for the forecasting model in part (a). c) Forecast the demand for all the relevant years using weighted moving average method with weights of 0.7 and 0.3. d) Calculate MAD for the forecasts obtained in part (c). NOUAWN