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Find the ACF px, the lag 1 and lag 2 PACF and the variance (assume that or = 5) for each of the following models:

Find the ACF px, the lag 1 and lag 2 PACF and the variance (assume that or = 5) for each of the following models: (a) Z, = (1 - 0.5B - 0.9B2)(1 - 0.5 B12)at, (b) Z, = a, - 0.2a,-12 - 0.5a1-24 - 0.8a1-36

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