TI-83 Instructions

Boxplots and Five-Number Summaries

Boxplots

Enter the Data

1. Enter the data into list L1.

Find the max and min

1. Press STAT. Several menu titles appear. EDIT is highlighted.
2. Use the arrow key to select the CALC menu title. The CALC menu appears.
3. Item #1, 1-Var Stats, is already highlighted.
4. Press ENTER. The phrase 1-Var Stats appears in the window.
5. Press 2nd L1.
6. Press ENTER. A list of statistics appears for the data in list L1.
7. Use the arrow key to scroll down to the min and the max, labeled minX and maxX. Record them.

Set up the Stat Plot

1. Press 2nd STAT PLOT (in the upper left corner). The STAT PLOTS menu appears.
2. Use the arrow key to select one of the plots, say Plot1.
3. Press ENTER.
4. Use the left/right arrow keys to select On.
5. Press ENTER. This turns Plot1 on. (The other plots should be turned off.)
6. Press the down arrow once. This allows you to select the type of plot.
7. Use the left/right arrows to select the boxplot type, the fifth one. (The icon looks like a little boxplot with the median line through the box.)
8. Press ENTER.
9. Press the down arrow once. This allows you to select the list containing the data.
10. Press 2nd L1.

Set up the Window

1. Press WINDOW (on the top row of buttons).
2. Next to Xmin, enter a value that is as least as small as the minimum.
3. Press the down arrow once.
4. Next to Xmax, enter a value that is as least as large as the maximum

Draw the Boxplot

1. Press GRAPH (in the upper right corner). The boxplot appears.

Five-Number Summaries

Method 1 (without a boxplot)

1. Enter the data into list L1.
2. Press STAT. Several menu titles appear. EDIT is highlighted.
3. Use the arrow key to select the CALC menu title. The CALC menu appears.
4. Select item #1, 1-Var Stats.
5. Press ENTER. The phrase 1-Var Stats appears in the window.
6. Press 2nd L1.
7. Press ENTER. A list of statistics appears for the data in list L1.
8. Scroll down the list, using the arrow key. The last five statistics are the five-number summary (minX, Q1, Med, Q3, maxX).

Method 2 (with a boxplot)

1. Follow the instructions above to create a boxplot of the data.
2. Press TRACE (on the top row of buttons). A blinking X appears at the median line in the boxplot. The value of the median is displayed at the bottom of the window.
3. Press the right arrow key once and then again to see the third quartile Q₃ and the max.
4. Press the left arrow key to see the first quartile Q₁ and the min.