| Sumario: | The article lays emphasis on incorporating sampling techniques in a research work in order to save money and other resources. In many cases, a researcher is unable to cover the whole population of interest in which case, a sample that is part of the population is taken. When a researcher uses only part of a given population, we refer to the study as a sample survey and in the case where a researcher uses the whole population in a given research; we say that researcher is carrying out a 'census' or mass survey. The purpose of this article is to guide researchers understand the philosophy behind sampling in educational research.
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