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returns borders and length of confidence intervall for difference of binomial proportions
KIbinomial_u(p1, n1, p2, n2, alpha)
confidence intervall
proportion obeserved in group 1
number of observations in group 1
proportion obeserved in group 2
number of observations in group 2
error niveau
KIbinomial_u(0.25, 100, 0.4, 150, 0.05)
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