Question: computations and visualization should be done in R. In this R file, you can include your descriptions as comments using #: Problem 4 (18

computations and visualization should be done in R. In this R file, you can include your descriptions as comments using #: Problem 4 (18 points total, 6 points each part) For the AR (2) series shown below, first check whether they are causal or not. (a) xt + 1.6-1 +0.64xt-2 = Wt (b) t 0.40xt-1-0.45xt-2 - = Wt (c) t 1.2xt-1+0.85xt-2 = Wt -

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