compare two diagrams in order to make decisions about an hypothesis
compare two distributions in order to make decisions about an hypothesis by comparing the range, or the inter-quartile range if available, and a suitable measure of average such as the mean or median.
Notes
Any of the charts and diagrams from S3.2h could be used as a basis for comparing two distributions.
Examples
From two box plots: Compare the data for the yield of plants with and without fertiliser. (median and inter-quartile range comparisons expected)