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mean, mode, median sensitivity
mean is most sensitive to extremes
mode is for nominal
median for ordinal
mean for IR
distribution and skews
mean less neg
mean more pos
if skewed use median bc not sensitive to extremes
appropriate measures of variability
nominal - iqv
ordinal - iqr and iqv
interval ratio - range, v/sd, iqr
location of median
n+1/2