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The Chi-Squared Distribution


	The sum of squares of independent standard normal random variables is a chi-squared random variable with degrees of freedom. This distribution is a special case of the gamma distribution that arises in statistics when estimating the variance of a population. The red vertical line marks the mean of the distribution.


	Contributed by: Chris Boucher

Chi-Squared Distribution (Wolfram MathWorld)

"The Chi-Squared Distribution" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TheChiSquaredDistribution/

Contributed by: Chris Boucher

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