chi-square distribution

noun

Definition of chi-square distribution 

: a probability density function that gives the distribution of the sum of the squares of a number of independent random variables each with a normal distribution with zero mean and unit variance, that has the property that the sum of two or more random variables with such a distribution also has one, and that is widely used in testing statistical hypotheses especially about the theoretical and observed values of a quantity and about population variances and standard deviations

First Known Use of chi-square distribution

circa 1956, in the meaning defined above

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The first known use of chi-square distribution was circa 1956

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