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 * Classpad 330 CAS Calculator ** toc


 * Statistics **

**A Frequency Table**
Go to the Statistics Screen by clicking on Statistics icon in the main menu.

You will see a screen a bit like a spreadsheet with the rows numbered down the left side.

Enter your data in the first blank column (LIST 1) (one value per line)

Enter the frequencies in the second blank column (LIST 2)

The screen shot to the right shows the Statistics screen with a frequency table entered.

Statistical Measures
Go to the CALC menu and select **One-Variable**

You should see a pop-up screen like the one below. Use the drop down menus to set XList = List1 Freq = List2

Press OK and you should see a screen a bit like the one to the right.

{You will need to use the scrollbar to see all the information. The screen shown is actually photoshopped together.}

math \\ \bar{x} \quad \text{ is the mean of the data} \\ \\ \sum x \quad \text{ is the sum of the data} \\ \\ \sigma_x \quad \text{ is the standard deviation of the data} math {See Measures of Spread}

math \\ n \quad \text{ is the number of values in your data} \\ \\ Q_1 \text{ and } Q_3 \; \text{ are the 1st and 3rd Quartiles} \\ \\ \textit{minX } \text{ and } \textit{ maxX } \; \text{ are the minimum and maximum values} \\ \\ \textit{Med } \quad \text{ is the median of the data} \\ \\ \text{and } \textit{ Mode } \text{ is ... well ... the mode!} math

Drawing a Histogram
Open the SETGRAPH menu.

The first box should be ticked (StatGraph1) Click on SETTING and you should see a pop up box.

Change the current settings to
 * Draw** should be on
 * Type**: Use the dropdown menu to select **Histogram**
 * XList** = List 1
 * Freq** = 1

Click SET and you will be returned to the Statistics screen.

Now click the graph icon (first one on the left) The next pop-up box you see allows you to set the horizontal scale for your Histogram. You can usually just press OK immediately and accept the scale suggested by the calculator.

The calculator screen will now split into two and display a histogram in the bottom half of the screen.

You may need to adjust the scale on the x-axis (xmin and xmax) and the scale on the y-axis (ymin and ymax) so that your data is properly displayed within the screen.

Only one of the two split screens can be active. You can jump between the two screens by clicking anywere in the other screen, or by clicking on the first icon on the left (which now looks like a table.)

The icon bar and the menu bar change depending on which screen is active.

The **Resize** and **Swap** icons in the green bar at the bottom of your screen allow you to change the position of the two split screens.

The XY icon allows you to step through the columns using the blue arrow keys on your keypad and view the data for each column. This icon only appears when the graph screen is active.

Drawing a BoxPlot
With the table screen active, open the SETGRAPH menu. The first box should be ticked (StatGraph1)

Change the settings to
 * Draw** should be on
 * Type**: Use the dropdown menu to select **MedGraph**
 * XList** = List 1
 * Freq** = List 2

{You can choose whether to show outliers}

Click SET and you will be returned to the Statistics screen.

Now click the graph icon (first one on the left)

The calculator screen will now split in two and display a boxplot in the bottom half of the screen.

You may need to adjust the scale on the x-axis (xmin and xmax) and the scale on the y-axis (ymin and ymax) so that your data is properly displayed within the screen.

The XY icon allows you to step through the boxplot using the blue arrow keys on your keypad and view the data for each position. This icon only appears when the graph screen is active.

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