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[4 pts] Many empirical researchers used to model US GDP time series Yt using the following random walk model: Yt = c+ Yt-1 + Et,

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[4 pts] Many empirical researchers used to model US GDP time series Yt using the following random walk model: Yt = c+ Yt-1 + Et, Et ~iid N(0, 1). (1) Suppose that c = 5.1 and the US GDP in the second quarter of 2018 is 180. What is the best prediction of the US GDP in the third quarter of 2018 based on the model in (1)? [4 pts] Suppose that Yo ~ N(0, 1) which is independent of at for any t. Find E[Y+] and Var (Yt). Is Yt covariance stationary

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