what is sample source   what is sample source 

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In statistics and quantitative research methodology, a data sample is a set of data collected and/or selected from a statistical population by a defined procedure. The elements of a sample are known as sample points, sampling units or observations or sample source.
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In statistics, a sampling frame is the source material or device from which asample is drawn. It is a list of all those within a population who can be sampled, and may include individuals, households or institutions.
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