This standard describes specific statistical methods for addressing the following questions: a) Given a population of items from which a sample of n items has been drawn, x of the sample items are found to show a specified characteristic. What proportion of the population has that characteristic? (see A forms, subclause 8.1)). b) Is the proportion estimated in a) different from a nominal (specified) value? (see B forms, subclause 8.2). c) Given two distinct populations, are the propotions with the characteristic in the two populations different? (See C forms, subclause 8.3). d) In b) and c) how many items must be sampled in the population(s) to be sufficien