Nomograms for obtaining a necessary, minimum sample size. II. When distribution of proportions from binomial data is approximately normal.

Two different nomograms corresponding to finite and infinite populations were devised to obtain a necessary, minimum sample size at a 95% confidence rate when the distribution of sample proportions calculated from binomial data was approximately normal. They could also be used for obtaining the 95% confidence limits of the population proportion from a sample proportion after having carried out a work.