You are given PACF for two stationary processes: (a) For time series {Xt, t = 1, 2, . . .} : ?11 = 0, ?22 = 0.36, ?kk = 0 for k ? 3. (b) For time series {Yt, t = 1, 2, . . .} : ?11 = 0.7, ?kk = 0 for k ? 2. In each case, what is an appropriate equation for the corresponding stationary process?

3. You are given PACF for two stationary processes: (a) For time series {Xht = 1,2, . . .} : (1511 = 0, (1522 = 0.36, 45],], = 0 for k 2 3. (b) For time series {Y},t = 1, 2, . . .}: $11 = 0.7, qbkk = 0 for k: 2 2. In each case, write an appropriate equation for the corresponding stationary process