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Mean, standard deviation, and SEM calculator

Calculate the arithmetic mean, sample standard deviation, and standard error of the mean.

Applied rule

Uses sample SD with n − 1 and SEM = sample SD / √n.

Boundary

SEM describes precision of the estimated mean, not the spread of individual observations or scientific validity.

Result

Enter your own values or load the documented example, then run the local check.

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Method source

NIST/SEMATECH e-Handbook of Statistical Methods. The source supports the underlying convention or review method; it does not endorse LabCrux.