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362 Data&Statistics Application
Creating Box Plots
The Box Plot Tool plots one-variable data in a modified box plot. “Whiskers”
extend from each end of the box, either to 1.5 times the interquartile range or to
the end of the data, whichever comes first. Points that are a width of
1.5*Interquartile Range past the quartiles plot individually, beyond the
whiskers. These points are the potential outliers. When no outliers exist, x-min
and x-max are the prompt for the end of each whisker.
Box plots are useful for comparing two or more sets of data that use the same
scale. If a dataset is large, a box plot can also be useful in exploring data
distribution.
1. Click the Add Variable region in the center of an axis. The default plot for
one numeric variable is a dot plot. For more information, see Plotting
Variables .
Note: If two variables are plotted in the work area, you can create a dot plot
by removing one variable. Choose RemoveXVariable or
RemoveYVariable from the Plot Types menu.
2. On the Plot Types menu, click Box Plot.