Sometimes we have to estimate the interquartile range from a cumulative frequency diagram. It is acceptable when dealing with an even total cumulative frequency to use LQ = \(\frac{n}{4}\) ...
The first plot in the example uses a SYMBOL definition with INTERPOL=BOXT20 to specify a box plot with whisker tops at the 80th percentile and whisker bottoms at the 20th percentile. Data points that ...