Box Plots

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The two box plot types only differ in their orientation.  All other options are equivalent.




You can choose whether to show outliers on the box plot.  You can also choose whether or not to differentiate between extreme outliers and mild outliers.  the stat tool uses the following definitions for outliers.


Outlier                                >1.5 Interquartile Ranges from the Median

Extreme Outlier                > 3 Interquartile Ranges from the Median




You can also add an "informal" confidence interval bar to a box plot.  This is a recent addition to the New Zealand curriculum.  The confidence interval bar is drawn between