Sampling is that part of statistical practice concerned with the selection of individual observations intended to yield some knowledge about a population of concern, especially for the purposes of statistical inference. Each observation measures one or more properties (weight, location, etc.) of an observable entity enumerated to distinguish objects or individuals. Results from probability theory and statistical theory are employed to guide practice.The sampling process consists of seven simple stages:Defining the population of concernSpecifying a sampling frame, a set of items or events possible to measureSpecifying a sampling method for selecting items or events from the frameDetermining the sample sizeImplementing the sampling planSampling and data collectingReviewing the sampling process

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