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2. Suppose that Yt = A + Bt + Xt, where Xt is a random walk. 2.1. First suppose A and B are constants. Is

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2. Suppose that Yt = A + Bt + Xt, where Xt is a random walk. 2.1. First suppose A and B are constants. Is Yt stationary? Is VYt stationary? 2.2. Now suppose that A and B are random variables that are independent of the random walk Xt. Is Yt stationary? Is VYt stationary

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