(adsbygoogle = window.adsbygoogle || []).push({}); Changes to Standard Deviation??

How many of you know that Standard Deviation has changed.

It used to be:[tex]\sqrt{\frac{\Sigma(x_i - \overline{x})^2}{n}}[/tex]

And now it is:[tex]\sqrt{\frac{\Sigma(x_i - \overline{x})^2}{n - 1}}[/tex]

It is the Variance of data but square rooted:

[tex]s^2 = \frac{\Sigma(x_i - \overline{x})^2}{n - 1}[/tex] convertd to: [tex]s = \sqrt{\frac{\Sigma(x_i - \overline{x})^2}{n - 1}}[/tex]

Not really anything important, just wanted people to know and comment (if necessary) on the fact that it has changed.

The Bob (2004 ©)

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# Changes to Standard Deviation?

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