Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test samples.

Few successful companies or government bodies make impulse moves. While that may frustrate those who want instantaneous results from a public program or the immediate expansion of product purchasing ...

Cochran (1977) outlines eleven steps in the planning of a survey. Good sampling methods must exist in the environment of all of these steps. These steps are (1) a statement of the survey objectives, ...