Refer to last session's in-class exercises #1, #2, and #3, calculate the weekly forecast error for week 4 to ? for all three forecasting methods. Then compute the Mean Absolute Deviation (MAD) for week 4 through 7 for each forecasting method. What is the most appropriate forecasting method among the three according to MAD ? Forecasting Method: (Simple) Moving Average Method with N=3. First, fill in the forecasts for week 6 and 7 based on your results from last session's exercise (or the results from the exercise key). Then calculate forecast error for week 4 to 7 . Forecasting Method: (Simple) Exponential Smoothing with =0.3. First, fill in the forecast for week 6 and 7 based on your results from last session's excrcise (or the results from the exercise key). Then calculate forecast error for week 4 to 7