For the following models, determine whether they are stationary or not. If yes, calculate their autocovariance...

   

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For the following models, determine whether they are stationary or not. If yes, calculate their autocovariance functions (ACFs), that is, Yo, Y1, V2, .. (a) DGP1: yt = 0.75yt-1+ Et (b) DGP2: Yt = -0.75yt-1 + t (c) DGP3: yt = t + 0.75t-1 Yt (d) DGP4: yt = 0.5yt-1 +0.25yt2+ t For the following models, determine whether they are stationary or not. If yes, calculate their autocovariance functions (ACFs), that is, Yo, Y1, V2, .. (a) DGP1: yt = 0.75yt-1+ Et (b) DGP2: Yt = -0.75yt-1 + t (c) DGP3: yt = t + 0.75t-1 Yt (d) DGP4: yt = 0.5yt-1 +0.25yt2+ t