Chi-squared distribution - Wikipedia

StatWRLecture6.ppt

Let X1, X2, and X3 be independent random variables with standard normal distribution. What is the density function of Y =X1^2+X2^2+X3^2? - Quora

Chi-square Test: Formula, Uses, Table, Examples, Uses

Chi-Squared Distribution, PDF, Chi Squared Distribution

Chi-squared test - Wikipedia

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Chi Distribution -- from Wolfram MathWorld

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Noncentral chi-squared distribution - Wikipedia

Chi distribution - Wikipedia

File:Scaled chi squared cdf.svg - Wikipedia

Noncentral chi-squared distribution - Wikipedia