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Given a data​ set, how do you know whether to calculate σ or​ s?

User Xuchunyang
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\sigma is the population standard deviation while s is the sample standard deviation.

When given a data set, one would have to determine if it represented the population or if it was a sample taken from the population.

If the data are a population, then
\sigma is calculated. If the data are a sample, then s is calculated.
User Eastboundr
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