TC3 → Stan Brown → TI-83/84/89 → Box-Whisker TI-83/84
Updated 18 Dec 2012

# Box-Whisker Plots on TI-83/84

Summary: You can use your TI-83/84 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:

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

### Step 1: Enter the numbers in L1.

 Enter the data points. [`STAT`] [`1`] selects the list-edit screen.   Cursor onto the label `L1` at top of first column, then [`CLEAR`] [`ENTER`] erases the list.   Enter the x values. (The order doesn’t matter.)

### Step 2: Clear other plots.

In this step, you disable any other plots and graphs that could overlay your box-whisker plot.

 Press [`Y=`] to open the list of equations and plots. Look at the plots across the top, and look at the column of = signs. If any are enabled (highlighted), disable them. Use the arrow keys to get to any highlight, and press [`ENTER`] to remove the highlight.   Caution! There are ten equations. Use [`▼`] to scroll down and check them all, down to Y0.

### Step 3: Set up the boxplot.

 Clear the grid and enable coordinate display for later use in tracing. Press [`2nd` `ZOOM` makes `FORMAT`].   If GridOn is highlighted, press [`▼` 3 times] [`ENTER`].   If CoordOff is highlighted, use the [`▼`] or [`▲`] key to get to CoordOn, and press [`ENTER`]. Select Plot1. Press [`2nd` `Y=` makes `STAT PLOT`] [`ENTER`]. Select the modified box-whisker plot. Press [`▼`] [`►` 3 times] [`ENTER`] [`▼`]. The bottom part of the screen may change when you do this. Select list 1, frequency 1, and squares for outliers. Press [`2nd` `1` makes `L1`] [`ENTER`].   Freq is probably already set to 1. If it is, press [`ENTER`]. If it’s not 1, press [`ALPHA`] [`1`] [`ENTER`].

### Step 4: Display the boxplot.

 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 [`ZOOM`] [`9`], which is ZoomStat or “zoom to statistics”. Press [`TRACE`]. Use [`◄`] and [`►`] to display the numbers in the five-number summary as well as any outliers.

This page is used in instruction at Tompkins Cortland Community College in Dryden, New York; it’s not an official statement of the College. Please visit www.tc3.edu/instruct/sbrown/ to report errors or ask to copy it.

For updates and new info, go to http://www.tc3.edu/instruct/sbrown/ti83/