Question: 7. For the model ARMA(2,2) with AR(2) cj 0.7 and 0.6 , and MA(2) cj 0.2, and 0.8: (i) Find a(B) and b(B), (ii) simulate

7. For the model ARMA(2,2) with AR(2) cj 0.7 and −0.6 , and MA(2) cj 0.2, and −0.8:

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

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