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Held: Friday, 11 April 2008
Summary: We begin to consider what samples from two populations tell us about the relationships between those populations.
p's have implicit hats.
pc = (p1*n1+p2*n2)/(n1+n2)
z = (p1-p2)/sqrt(pc*(1-pc)*(1/n1+1/n2))
lb = (p1-p2) - z*sqrt(p1*(1-p1)/n1 + p2*(1-p2)/n2)
ub = (p1-p2) + z*sqrt(p1*(1-p1)/n1 + p2*(1-p2)/n2)
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