Question 3 (2 points) Suppose you want to fit the following time series model: Y+ = ct + et - QYt-1, t = 1, 2, ... Assume that you have observations Yo, Yl, ... , Yn. Also, from past experience, you have decided to set = 0.5. . Assuming you use least squares, what is the least-squares estimate of c? O E;1(Y; - 0.5Y;-1)j O EMI (Y; - Y)(Y;-1 - Y) EI ( Y; - Y)2 O Ejlj - n/21 ONone of the other answers are correct