Suppose that at - WN(0, 1). (a) calculate the ACF of xt = at +0.5at-5; %3D (b) calculate the ACF and PACF of xt = ¢2xt-2 + at; (c) calculate the ACF and PACF of xt = 01xt-1+a;; (d) calculate the ACF and PACF of xt = 01xt-1+¢2Xt-2+at. ACF is autocorrelation function, PACF is partial autocorrelation.

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