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4. Wicker Widget Works (WWW), manufacturer of the world famous Western White Widget (W3), would like to build a forecasting system to assist in production planning and inventory control. Demand for the past 6 months is shown below. Month Jan Feb Mar Apr May Jun Sales 100 90 95 100 105 95 (a) Develop a forecast for July using (i) a simple exponential smoothing model with = 0.20, (ii) a simple exponential smoothing model with = 0.50, and (iii) a 3-month moving average. (b) Which of the three forecasting models in (a) above provides a better forecast based on MAD