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Question 3 Given two time series for the year 2020: Month January February March April May June -1.049 -1.075 0.309 0.679 1.233 -0.560 Xi 0 0 0 1 1 Compute the forecasted values for Y, for July and August in 2020 by using the models stated in (a) to (d): (a) Moving average of order 4. (4 marks) (b) Single exponential smoothing with discount factor 0.2 (Remark: Use the January value as initial value). (10 marks) (c) The following ARIMA(0,0,1) model: Yt = -0.7 + &+ + 0.5Et-1 (10 marks) (d) The following dynamic regression: 0.7 Yt= 1 - 0.2B Xt-2 - 0.5Yt-1 + &t