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 (15[1])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■