**Statistics Notes: ****Standard deviations and standard errors**
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1255808/

Oct 15, 2005 · The terms “**standard error**” and “**standard** deviation” are often confused. 1 The contrast between these two terms reflects the important distinction between data description and inference, one that all researchers should appreciate. The **standard** deviation (often SD) is a measure of variability ...

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