Can't compute the standard deviation in your head? Divide the range by four. http://www.decisionsciencenews.com/2016/06/17/cant-compute-standard-deviation-head-divide-range-four/ … Cool mental stats hack, via @dggoldst
Replying to @cfchabris @dggoldst
Another alternative is to compute the AAD which is very close to the SD. https://en.wikipedia.org/wiki/Average_absolute_deviation …
5:43 AM - 18 Jun 2016
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