Assume independence, and let p ij = n ij /n and ÏÌ ij = p i+ p
Question:
a. Show that pij and ÏÌij are unbiased for Ïij = Ïi+ Ï+j.
b. Show that var(pij) = Ïi+ Ï+j(1 Ïi+ Ï+j)/n
c. Using E(pi+ p+j)2 = E(p2i+) E(p2+j) and E(p2i+) = var (pi+) + [E(pi+)]2, show that
Transcribed Image Text:
) = {T;+ T+[T;+ (1 – 7+;) + T +; (1 – T;+ var( î¡;) + π- (1- π.) π., (1- π.;)/n'.
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