Question: (10pts each) Identify the following models as ARMA (p,q) models (watch out for pa- rameter redundancy), and determine whether they are causal and/or invertible.

(10pts each) Identify the following models as ARMA (p,q) models (watch out for pa- rameter redundancy), and determine whether they are causal and/or invertible. = (a) x 0.5x-1 -0.25x-2+ w +0.8w+-1 -0.2w+-2 (b) x = 2.6-1+1.2x-2+ w 2.9wr-1 -0.3wr-2

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