Data collected on the yearly demand for 50-pound bags of fertilizer at Wallace Garden Supply are shown in the following table. Week Demand for Fertilizer (1,000 of bags) 10 8 9 12 10 14 11 15 Calculate the forecast of the price for week 12 by using 3 weeks weighted moving average (WMA). Use the weight of 3 for the latest period, 2 for the second latest period and 1 for the third latest period (4 marks) (b) Calculate the forecast of the price for week 12 by using exponential moving average (EMA) model with a = 0.2 as the smoothing constant Initial week 1 forecast was 4. (5 marks) Determine the forecast error of (@) and (b) using mean squared error (MSE) and mean absolute deviation (MAD) (14 marks) Justify which forecast is more accurate based on answer in (c). (2 marks) [Total: 25 marks]