The interquartile range is another measure of spread ... so the UQ is the 30th number. To find these from the graph we draw two lines across from the vertical axis, one at 10 and one at 30.

A box plot is a diagram which provides a quick ... A cumulative frequency diagram is also a good way to find the interquartile range, which is the difference between the upper quartile and lower ...

Visualization methods enhance our understanding of sample data and help us make comparisons across samples. Box plots are a simple but powerful graphing tool that can be used in place of ...

Whiskers extend from the quartiles to the farthest observation not farther than 1.5 times the distance between the quartiles (the interquartile range). Beyond the whiskers, extreme observations are ...