Let Z1, Z2,... be i.i.d. N (0, 1). For each of the time series defined below, random variables, decide if the series is (weakly) stationary. 2nt Y. = cos + Zt = cos (ZŁ) We =t· Z V = E cos (Z:) i=1 t+5 t-i Ut = cos (Z;) i=t-5 t-i Qt cos (Z;) i=1

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