Question: 3. (10 points) Identify the following models as ARMA (p, q) models, i.e., identify p and q based on these model equations. For each

3. (10 points) Identify the following models as ARMA (p, q) models,

3. (10 points) Identify the following models as ARMA (p, q) models, i.e., identify p and q based on these model equations. For each model, discuss whether they are stationary and/or invertible. a. Xt=0.8Xt-1 - 0.15Xt-2 + at 0.3at-1 b. X = Xt-1 - 0.5Xt-2 + at -at-1

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