6. Percentiles and Quartiles
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.
Box plots can also be drawn vertically. SPSS draws box plots vertically; this is especially useful for comparing datasets.