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3) Suppose {ety is a normal white noise process with mean zero and variance o. Let {Yi} be a process defined as: Y= et +

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3) Suppose {ety is a normal white noise process with mean zero and variance o. Let {Yi} be a process defined as: Y= et + 0et -1. a) Find the autocovariance function and autocorrelation function of Y for any general 0. Also, find the autocovariance function and autocorrelation function of Y. if 0 = 2. Show all your steps clearly. b) Is the time series { Y,} stationary? Explain your

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