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10 cards from this deck
Quantifies how spread out/variable data values are
Range, interquartile range (IQR), standard deviation
R=extlargestvalue−extsmallestvalueR = ext{largest value} - ext{smallest value}R=extlargestvalue−extsmallestvalue
Heavily influenced by extreme values/outliers
Spread of middle 50% of observations
extIQR=Q3−Q1 ext{IQR} = Q_3 - Q_1extIQR=Q3−Q1
25%
75%
Spread of data around the mean
Regular deviations always sum to zero
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