Web Reference: Learn how to use the standard deviation to measure and interpret the variability in a dataset. See examples, formulas, graphs, and tips for comparing different distributions. Learn how to calculate and interpret standard deviation and variance, measures of how spread out numbers are. See examples, formulas, and a calculator for population and sample data. A useful property of the standard deviation is that, unlike the variance, it is expressed in the same unit as the data. Standard deviation can also be used to calculate standard error for a finite sample, and to determine statistical significance.
YouTube Excerpt: The video above is more focused on the concept. This other one explains how it's calculated: ...
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