2. Which of the following forecasting models is superior for predicting future sales based on the sum of squared differences criterion? a) Constant model with a constant prediction of 102

b) Last period model c) Moving average model with n = 2 d) Moving average model with n= 3 e) Weighted moving average model with n= 2, C1 =0.6 , C2 =0.4 f) Weighted moving average model with z-3, C1= 6, C2 = 4, C3= 2 g) Exponentially weighted moving average model with xo = 76 and a = 0.35 h) Exponentially weighted moving average model with xo = 76 and a = 0.7