**Unformatted text preview: **of the sample in interval. • Useful for numerical data CalculaBng a Histogram • Data: 1, 2, 4 (only three observaBons) • Bins (0 to 3), (3 to 6) • First bin has 2 observaBons • Second bin has one observaBon • Height of ﬁrst bar: 2/3 • Height of second bar 1/3 Lots of histograms are sort of “normal” The exact “bell- shape” up to stretch and slide h]p://hyperphysics.phy- astr.gsu.edu/hbase/math/immath/gauds.gif A bit of terminology • Numerical • Categorical: Ordinal • Categorical: Nominal • 1, 2, 17.2 • High, Medium, Low • Male, Female Pie Chart Bar Charts Like a histogram, but, technically, diﬀerent: not intervals for numerical; values for categorical. CumulaBve Frequency The slope of the cumulaBve frequency line reﬂects the density of observaBons. CalculaBng cumulaBve...

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