Probability and Statistics > TI 83 for Statistics > TI 83 box plot

## TI 83 box plot: Overview

**Graphs and charts** help us make sense of data, see patterns, and identify trends. Without graphs, it can be difficult to make sense of data. For example, let’s say you have a list of IQ scores for a gifted classroom in a particular elementary school. The IQ scores are: 118, 123, 124, 125, 127, 128, 129, 130, 130, 133, 136, 138, 141, 142, 149, 150, 154. That list doesn’t tell you much about anything. However, with a chart or graph like a **box plot** (sometimes called a box-and-whisker plot), the data can come to life.

A box plot is a way to present the five number summary in a graphical format. The five number summary is the minimum, the maximum, the median, the first quartile Q_{1} and the second quartile, Q_{2}.

## TI 83 box plot: Steps

**Step 1:** Press STAT ENTER, to edit L1.

**Step 2:** Enter the data from the problem into the list:

1 1 8 ENTER

1 2 3 ENTER

1 2 4 ENTER

1 2 5 ENTER

1 2 7 ENTER

1 2 8 ENTER

1 2 9 ENTER

1 3 0 ENTER

1 3 0 ENTER

1 3 3 ENTER

1 3 6 ENTER

1 3 8 ENTER

1 4 1 ENTER

1 4 2 ENTER

1 4 9 ENTER

1 5 0 ENTER

1 5 4 ENTER

**Step 3:** Press 2nd Y=, to access the **Stat Plot** menu.

**Step 4:** Press ENTER ENTER to turn on **Plot1**.

**Step 5:** Arrow down to **Type**, which has 6 icons to the right of it. Highlight the bottom middle icon, which looks like a syringe with two plungers, and press ENTER to select it.

**Step 6:** Make sure the **XList** entry reads “L_{1}“. If it doesn’t, arrow down to it, Press Clear 2nd 1.

**Step 7:** Press Graph. You should see your Box plot!

**Tip**: If when you press Graph, you see the message “Err: Stat”, or you just don’t see a box plot like you expect to, then press Window, and try different settings. Especially try changing the **Xscl** (X Scale) item to a larger value.

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Step 7 should be:

To see the box plot, we need to tell the calculator that we are doing statistical graphing, rather then the more traditional xy-coordinate plane graphing. To do this, press the key, and then press the down arrow to move the cursor over ZoomStat (#9):

whJBiI Thanks again for the article post. Fantastic.