Tail Areas under Chi-Squared Distributions

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Tail probabilities from various probability distributions are used in constructing confidence intervals and hypothesis tests in statistics. The symbol is the number such that the area under a probability distribution with degrees of freedom to the right of is equal to α. Thus, this number is the left boundary of the right tail and the number is the right boundary of the left tail.

Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA


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