I have always thought that the operation:(adsbygoogle = window.adsbygoogle || []).push({});

((sum(x1-(x-ave))^2).....XN-(x-ave))^2/(N-1))^.5

was known as the standard deviation. But now my physics text says that it is:

((sum(x1-(x-ave))^2).....XN-(x-ave))^2/(N))^.5

and another website I went to says that yes, the second equation is the correct terminology and that the first equation is the square root of the bias-corrected variance, and that the two are often confused. So what operation does the "standard deviation"

operation on my TI-89 do? and how do I do the other one?

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# Confused about statistics terms

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