median
don steward
mathematics teaching 10 ~ 16

Monday, 20 December 2010

standard deviation

this routinely used (sophisticated) measure of the spread of a distribution doesn't feature (currently) in the English maths national curriculum - which seems a shame

it is, sensibly, in the Scottish curriculum









these small data sets have the same mean (of 11) and integer standard deviations
they can be useful for students to work through the steps of the calculations, considering why the steps make (some) sense

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