Fred Seibert has posted a group of publicity postcards created to promote his new series, Random Cartoons. Thirty-nine animated shorts were produced by the likes of Bill Plympton, John Dilworth ...

Simple random sampling is the most basic form of analyzing a population, allowing every item within it to have the same probability of being selected.

With simple random sampling and no stratification in the sample design, the selection probability is the same for all units in the sample. In this sample, the selection probability for each customer ...

Another common method of achieving a random or representative sample is referred to as systematic sampling. With this method, to begin, members—or elements—of a study, are chosen from a random ...