Question 1107255
proportion 1 is 26/92=0.2826
proportion 2 is 28/63=0.4444
Their difference is -0.1618
the CI is 0.1618+/- z(0.99)sqrt (p1(1-p1))/n1+(p2(1-p2))/n2))
=-0.1618 +/- 2.326*sqrt (0.006122)
=-0.1618+/-0.1820 or (-0.344, 0.020)