6. Percentiles and Quartiles
6.3 Box Plots
A box plot is a plot that shows 
, 
and MD (= 
) along with H and L (= 
and 
) as shown in Figure 6.3. It especially emphasizes the IQR.
Example 6.5 : Construct a box plot for the data shown in Figure 6.4. Again, someone has done the first, tedious, step of ordering the data for us.
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Box plots can also be drawn vertically. SPSS draws box plots vertically; this is especially useful for comparing datasets.
