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4. (a) Check the stationarity and then find the mean and the autocovari- ance function of the process y = 2 +1.3yt1 -0.448-2+z++Zt-1, z ~WN(0,02)

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4. (a) Check the stationarity and then find the mean and the autocovari- ance function of the process y = 2 +1.3yt1 -0.448-2+z++Zt-1, z ~WN(0,02) (1) (b) Is this process covariance-stationary? (c) Is this process invertible? 4. (a) Check the stationarity and then find the mean and the autocovari- ance function of the process y = 2 +1.3yt1 -0.448-2+z++Zt-1, z ~WN(0,02) (1) (b) Is this process covariance-stationary? (c) Is this process invertible

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