Question: 4. For the model ARMA(0,4) with cj 0.7 0.1i , 0.45, and 0.65: (i) Find a(B) and b(B), (ii) simulate and plot the data,

4. For the model ARMA(0,4) with cj 0.7 ± 0.1i , −0.45, and 0.65:

(i) Find a(B) and b(B), (ii) simulate and plot the data, (iii) how is it known the model is invertible?

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