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n (a) Let X1, Xn be i.i.d. random variables with E[|X1|] < and let S = 1 Xi. Calculate E[S|X1] and E[X|Sn]. (b) Let
n (a) Let X1, Xn be i.i.d. random variables with E[|X1|] < and let S = 1 Xi. Calculate E[S|X1] and E[X|Sn]. (b) Let (N,F,P) be a probability space and G C F a sub--algebra. Assume furthermore that E[X] < . (i) Show that E [(X Y)] = E [(X E[X|G])] + E [(E[X|G] Y)] holds for all Y: (N,G) (R,B(R)) with E[Y] < (i.e. all square-integrable, G- B(R)-measurable (!) random variables Y).
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