使用正常的近似计算样本大小项式：因此，样本量的35，一个一边倒的95词用于单个使用大样本的正常比例逼近将延长0.100从观察到的比例，预计0.85的比例。
sample size was computed by using the normal approximation to the binomial : thus with a sample size of 35, a one-sided 95 ci for a single proportion using the large sample normal approximation will extend 0.100 from the observed proportion for an expected proportion of 0.85.