i. ii. iii. Month Month Month Demand Demand Demand 1 2 3 1 58 1 74 1 66 2 200 2 228 2 280 3 404 3 384 3 436 4 308 4 348 4 288 Determine the seasonal factors for each quarter. Using the seasonality factors you found in part a, de-seasonalize the data and forecast for Month 4. using a MA(5). Using the data from Months 2 and 3, determine initial values of the intercept, slope, and seasonal factors for Winters's method.