Random Marble Grabber
(With Chi-Squared Test)
This java applet pulls a random marble from a bag, and calculates the Chi-Squared value. The Chi-Squared value can be used to determine if the marbles pulled from the bag are really randomly chosen by the computer.
Since there are 10 marbles, there are 9 degrees of freedom.
For a more detailed explanation of a Chi-Squared test, please see:
Applet Source, Written by Nicholas Exner.