Bessel's correction

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Notion

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Science and technology

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What Wikipedia says

In statistics, Bessel's correction is the use of n − 1 instead of n in the formula for the sample variance and sample standard deviation, where n is the number of observations in a sample. This method corrects the bias in the estimation of the population variance.

Excerpt from the Wikipedia article “Bessel's correction”, under the CC BY-SA 4.0 license. Read the article on Wikipedia