. Show that a value o for which the statistic z = (p- To)/(1-T)/N takes some fixed value zo is a solution to the equation (1 + 2/N) m +(-2p- /N)To+p = 0. Hence, using the formula x = (-b b2-4ac)/2a for solving the quadratic equation ax + bx + c = 0, obtain the limits for the 95% confidence interval in Section 1.3.3 for the proportion of Americans favoring legalized abortion.