Confidence Interval Coverage

This applet investigates the trade-off between confidence and precision when constructing confidence intervals.

How to use the applet

  1. Type a sample size and level into the applet. 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. The applet generates 100 confidence intervals and plots them along with the true mean. Confidence intervals that cover the true mean are colored blue; those that don't are colored red. The applet also states how many of the confidence intervals cover the true mean.
  2. Click the Regenerate button to generate new confidence intervals with the same sample size and level.

The applet

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