A basic principle of probability sampling is that a sample will not be representative of the population from which it is selected if all members of the population have an equal chance of being selected in the sample. Samples that have this quality are often labeled equal probability of selection method (EPSEM) samples.

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A basic principle of probability sampling is that a sample will be more representative of the population from which it is selected if all members of the population have an equal chance of being selected in the sample. EPSEM samples are designed to ensure this equal chance, thereby aiming to make the sample representative.

A Basic Principle of Probability Sampling Is That a Sample