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
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useful mnemonic when combining data: total variance = variance of means + mean of variances
Thanks. Twitter will use this to make your timeline better. UndoUndo
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