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5) Suppose {a} is a normal white noise process with mean zero and variance 5.3.2. Let {Y1} be a process dened as: Y1 = 6161

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5) Suppose {a} is a normal white noise process with mean zero and variance 5.3.2. Let {Y1} be a process dened as: Y1 = 6161 1. Showing all your steps, nd the mean function and the autocovariance function of Y1. Is the time series { Yr} stationary? Explain your

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