Forming a confidence interval (CI) for a binomial proportion is one of the most basic problems in statistics, since the lattice nature of the binomial distribution leads the problem complicated. Let X be a binomial variable with n trials and a binomial proportion p. It is well known that p^1⁄4X=n is the maximum likelihood estimator of p. Utilizing normal approximation roughly, we have the Wald interval which is ever used for its simplicity