Confidence Interval for aPopulation Proportion (1)• To estimate a population proportion we proceed in the samemanner as when estimating a population mean. A sample isdrawn from the population of interest, and the sampleproportion, ,̂is computed. This sample proportion is used asthe point estimator of the population proportion.• When both np and n(1-p) are greater than 5, we consider thesampling distribution of ̂to be quite close to the normaldistribution.