The Normal Distribution

This applet compares the normal distribution with the standard normal.

How to use the applet

  1. In the table at the top, enter values for the mean of eqn, eqn, the standard deviation of eqn, eqn, and a percentile, eqn. eqn can be any number between -100 and 100; eqn can be any number in the range eqn; and eqn can be any number in the range eqn. Note, these cells act like a spreadsheet application; to change an entry, click on it, delete the current value, type a new one, and then press enter.
  2. Below the table, plots of eqn and eqn are drawn and labeled "Normal Distribution" and "Standard Normal Distribution," respectively. eqn is the z-score for eqn, related by the equation
    eqn.
  3. On either plot, you can drag the slider labeled x or z. The percentile and the corresponding shaded region in the other plot are updated as you drag the slider. You cannot drag the slider beyond p = .001 or p = .999.

The applet

No Java Plug-in support for applet, see http://java.sun.com/products/plugin/