Although sample size is very important, it is by no means the only determinant of what constitutes adequacy of the sample. It is critical that the sample be selected according to well-established, specific principles. The purpose of this chapter is to discuss these principles and the methods of sample selection that have been adapted and derived from them.

Probability Sampling

Sampling methods can be categorized into probability sampling and nonprobability sampling. In probability sampling, the probability that any member of the working population will be selected to be part of the eventual sample is known. This implies extensive and thorough knowledge of the composition and size ...

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