don steward
mathematics teaching 10 ~ 16

Thursday, 21 January 2016

mean of the means

finding the mean of the means for different sizes of subgroups is a way of practicing this skill, subsumed within the larger task of establishing when the mean of the means is equal to the mean of the (parent) set

this happens most obviously when the subsets have the same size

but there are other cases when they are the same

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