Q3. A time series {X+} consists of two independent random white noise processes, = 2w++ wt-1 + nt (independent means w and not uncorrelated for any related time shift, i.e., Cov(ws, nt) = 0 for all s, t), where the white noise wt and nt both have the same mean 0 and variance 3. Calculate the cross-correlation function w,x (h) between {wt} and {X}, where h is the relative time shift.