Question: Consider an N - span moving average where each observation isweighted by a constant,say,a; > = 0 . Therefore the weighted movingaverage at the end

Consider an N-span moving average where each observation isweighted by a constant,say,a;>=0.Therefore the weighted movingaverage at the end of period T is
a.Why would you consider using a weighted moving average?
b.Show that the variance of the weighted moving average is Var(M?)=o^2Zj=d}.

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