(Correlation and Regression)

Statistical investigations are often interested in changes in a variable over time,
or relationships among several variables. This applet describes straight-line relationships
between two variables using the methods of **correlation** & **regression**.

The applet is organized as five "tabbed" display screens.
The **Data Sets** tab allows users to enter data directly into columns A and B.
The **Correlation & Regression** tab provides a numerical summary of the data.
**Scatterplot** graphically displays the data. Click the "Show least-squares line" checkbox
to display the least-squares regression line and equation. To help assess the fit of the
regression line select the **Residuals plot** tab.

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}.

© 2009 W. H. Freeman & Co. and Sumanas, Inc.