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Tool: Ball and Urn Experiment
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Description: Simulates drawing balls from an urn, with or without replacement. Specify number of balls, number of red balls, and number drawn. Requires a MathPlayer plugin (free).
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Authors: Dept. of Mathematical Sciences
Univ. of Alabama at Huntsville
Language: English 
Cost: Does not require payment for use

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Tool: Probability/Statistics Object Library
Courses: Probability & Statistics Simulating Experiments, Discrete Random Variables, Binomial Distributions

Comment:Bravo! This is a colorful, easy to use site that illustrates a theoretical and simulated binomial distribution (and the CLT). This activity can also be done in Fathom. A demo is written in the resource Fifty Fathoms with terrific follow up questions.