Standard Error of the Mean (SEM)

$SEM = sigma /sqrt "N"$

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The standard error of the mean (SEM) is the standard deviation divided by the square root of the number of data items. This quantity is useful in that it helps quantify the uncertainty in the estimate of the mean.

This equation is shown as: $sigma_m = sigma/(sqrt(N))$

where: sigma = standard deviation of the data set and N = number of data items