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2. Consider the process Zt=at+at1+0.25at2,a2=20. (a) Identify the order of the ARIMA model for the process. (b) Is {Zt} stationary? (c) Is {Zt} invertible? (d)

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2. Consider the process Zt=at+at1+0.25at2,a2=20. (a) Identify the order of the ARIMA model for the process. (b) Is {Zt} stationary? (c) Is {Zt} invertible? (d) Find the ACVF (k) and ACF (k) of {Zt} for k=0,1,2,3,. (e) Find the values of k,k=0,1,2,3, if the process is written as at=k=0kZtk

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