{ (1 / (1+z^2/n))(p + z^2/(2n) - z*sqrt( p(1-p)/n + z^2/(4n^2))), (1 / (1+z^2/n))(p + z^2/(2n) + z*sqrt( p(1-p)/n + z^2/(4n^2))) } where n=58, p=13/58, z=1.96