Question: Problem 4: Consider the following models and check the causality or invertibility by finding AR or MA operators. 1. Check the causality and stationarity of

Problem 4: Consider the following models and check the causality or invertibility by finding AR or MA operators. 1. Check the causality and stationarity of the model below. Provide what time series model it is. Xt = 1.1xt-1 + Wt. 2. Check the invertibility and stationarity of the model below. Provide what time series model it is. at = Wt - 0.57Wt-1 3. Check the causality and invertibility of the model below. Provide what time series model it is. = t-1 + Wt + -Wt-1 6

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