A 1976 paper by Joel Cohen provides a model of this task analyzed in a 1981 Rao and Scott paper that provides corrections to chi-squared tests by generalizing design effect. A paper generalizing this task by Horvitz and Thompson introduced an inverse probability weighted estimator to analyze the results of this task. This task names “primary units” that are progressively subdivided in the multistage method of this task. A probability distribution created by averaging the results of (*) independently performing this task approaches the normal distribution according (10[1])to the central limit theorem. Another design for this task involves performing it separately with discrete categories, its “stratified” type. For 10 points, what task involves randomly selecting individuals in a population, such as its “simple random” kind? ■END■