Last week’s post, “A Histogram is NOT a Bar Chart ... more information than bar charts do for comparing variables.” That chart form is a box plot, also called a box and whisker plot.

Figure 22.4: Comparing Distribution Analyses The Moments and Quantiles tables below the histograms present statistics you can compare. The box plots and histograms, however, are difficult to compare ...

Box plots are a simple but powerful graphing tool that can be used in place of histograms to address both goals. Whereas histograms require a sample size of at least 30 to be useful, box plots ...