Consider the timeseries given by yt =a1yt-1 +a2yt-2 +?t. Where?t is independent white noise andyt is stationary.
A. Compute the mean ofyt.E(yt)
B. Compute the variance ofyt.E[yt ?E(yt)]2
C. Compute the first threeautocovariances for yt.(E[(yt?E(yt))(yt?i?E(yt?i))]i=1,2,3).