The pattern of variation of a variable is called its distribution. The distribution of a quantitative variable records its numerical values and how often each value occurs. The shape and spread of a distribution can be displayed graphically (e.g., Histogram, Stemplot) or summarized by descriptive numerical values (e.g., mean, standard deviation, quartiles).

This applet is organized as five "tabbed" display screens. Select a data
file from the **Data Set** tab. When the **Data** tab is selected
variables may be entered/edited. Enter one value per cell.
Click the trash to clear all current values. The **Statistics**
tab provides a numerical summary of the data.

**Histogram** graphically displays the data. Click and hold on a class
(brown bar) to display information about this class. Clicking on the histogram
and dragging the mouse left will reduce the number of classes. Dragging right
will increase the number of classes. The **Stemplot** tab will display the
data as a stemplot. Click the checkbox to **Split stems**.

Note: Some calculated values are reported using scientific notation. In such cases "e" stands for
a power-of-ten exponent. For example, 1.0e3 = 1.0 x 10^{3}, 1e-3 = 1.0 x 10^{-3}.