N is 4

= 1. (30) Consider the quarterly sales data: datal {10, 31, 43, 16, 11, 33, 45, 17, 14, 46, 50, 21, 19, 41, 55, 25} Forecast the volatility for the next quarter a) using EWMA with 1 = 0.9N (where N is the last digit of your student number) b) using GARCH(1,1) with w=0.000002 ,a = 0.04 and 3= 0