2001 Roanoke Appendix V

Appendices
Appendix V
Explanation of Box Plots
A-V-1
Box plots (or box and whisker plots) show the distribution of measurements of a parameter.
Here the distribution of measurements of a hypothetical parameter are compared between Station
A and Station B. The percentage of measurements at or below a particular concentration are
indicated on the figure. Note that the median and variation of measurements taken at Station B
are greater than the median of Station A.