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definition of w:standard deviation
(definition of w:standard deviation)
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In [[w:statistics|statistics]] and [[w:probability theory]], the '''[[w:standard deviation|standard deviation]]''' (represented by the Greek letter sigma, '''[[w:Sigma|σ]]''') shows how much variation or [[w:statistical dispersion|dispersion]] from the average exists. ( Wikipedia )
In [[w:statistics|statistics]] and [[w:probability theory]], the '''[[w:standard deviation|standard deviation]]''' (represented by the Greek letter sigma, '''[[w:Sigma|σ]]''') shows how much variation or [[w:statistical dispersion|dispersion]] from the average exists. ( Wikipedia )
== Later weeks ==
In [[w:statistics|statistics]] and [[w:probability theory|probability theory]], the '''[[w:standard deviation|standard deviation]]''' ('''SD''') (represented by the Greek letter sigma, '''[[w:Sigma|σ]]''') shows how much variation or [[w:tatistical dispersion|dispersion]] from the average exists.
::A low standard deviation indicates that the data points tend to be very close to the [[w:mean|mean]] (also called expected value); a high standard deviation indicates that the data points are spread out over a large range of values. ( Wikipedia )
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