Answer each question based on the given data. The regression equation based on a given data's CMA (P=2) is Y=1+2X. a. Calculate the seasonal index for the 2020 Winter (S1). S1= b. Forecast Winter demand for year 1 using Winter's method with Alpha =0.5, Beta =0.5, and Gamma =0.5. c. Suppose L4 =10,T4=4,S5=3,S6=5, and S7=4. Forecast Winter demand for the year 4 using Winter's model with A Tick Save and Submit to save and submit. Click Save All Answers to save all answers