English: A plot of the cumulative distribution function for the scaled chi-squared probability distribution, the probability distribution of the sample variances2,
where s2 is the mean of the squares of ν independent normal distributions of mean 0 and standard deviation σ; plotted here for the case σ = 1.0.
Equivalently this is also a plot of the c.d.f. for the variance ratio s2/σ2 for any value of σ.
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