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chi-square distribution

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chi-square distribution
in statistical terms this is said of a variable with K degrees of freedom if it is distributed like the sum of the squares of K independent random variables each of which has a normal distribution with mean zero and variance of 1.

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Statistical analyses of changes in the prevalence of limitations, chronic conditions, and demographic factors were performed using chi-square distribution tests.
Appendix D: Percentiles of the Chi-Square Distribution.
where [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the chi-square distribution on n-1 degrees of freedom, [s.
 
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