# Box-Whisker Plots on TI-89

Copyright © 2015–2017 by Stan Brown

Copyright © 2015–2017 by Stan Brown

**Summary:**
You can use your TI-89 to create a box-whisker diagram,
also known as a boxplot. Boxplots give you a general idea of the
shape of the data, particularly its skew, and they highlight outliers
in the data set.

**Alternatives:**
If you have a TI-83/84, see
Box-Whisker Plots on TI-83/84 or use MATH200A Program part 2.

Let’s make a boxplot of this data set:

11 | 15 | 14 | 12 | 9 | 8 | 7 | 5 | 6 | 11 |

10 | 10.5 | 12 | 11 | 13 | 2 | 6 | 4 | 13.5 | 22 |

Get into the Stats/List Editor. | [`◆` ] [`APPS` ], select Stats/List Editor, and you
should be on the list entry screen. |

Enter the data points. |
Cursor to the heading `list1` (not the first data
line) and press [`CLEAR` ] [`ENTER` ] to clear the list.
Enter the x values. (The order doesn’t matter.) |

Disable any other plots and graphs that could overlay your box-whisker plot | [`F2` ] [`3` ] turns off statistics plots, and [`F2` ] [`4` ]
turns off graphs of equations. |

Get to the Plot Setup screen, and select a modified boxplot. (“Modified” means it shows outliers if there are any.) |
Press [`F2` ] [`1` ]. Then, cursor to an empty plot, or one you
don’t care about keeping.
Press [ `F1` ] [`►` ] [`5` ]. |

Fill in the Define Plot screen. |
Use the [`ALPHA` ] key to type `list1` :
[`ALPHA` `4` makes `l` ] [`ALPHA` `9` makes `i` ] [`ALPHA` `3` makes `s` ], then plain
[`T` ] [`1` ] [`ENTER` ] [`ENTER` ]. |

On the box-whisker diagram, any outliers show as isolated squares. The whiskers are mix and max (disregarding any outliers), and the box is first quartile, median, and third quartile. |
Press [`F5` ], which is ZoomData or “zoom to
statistics data”. |

Identify the outliers, if any. |
Press [`F3` ] to trace on the plot. Use [`◄` ] and
[`►` ] to display the numbers in the five-number
summary as well as any outliers. Here, you see that there is an
outlier with a value of 22. |

**2 Feb 2015**: New article.

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