**Sample (statistics) - Wikipedia**
https://en.wikipedia.org/wiki/Sample_%28statistics%29

In statistics and quantitative research methodology, a sample is a set of individuals or objects collected or selected from a statistical population by a defined procedure. The elements of a sample are known as sample points, sampling units or observations. When conceived as a data set, a sample is often denoted by capital roman letters such X {\displaystyle X} and Y {\displaystyle Y}, with its elements expressed in lower-case and the sample size denoted by the letter n {\displaystyle n}. Typica

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