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Six Sigma SPC's Quality Control Dictionary and Glossary
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Chi-Square Table

Tool based on hypotheses testing that incorporates a table of calculated probabilities, (i.e., tail areas under a bell shaped curve), based on a normal distribution using the probability and degrees of freedom. Table is used to pinpoint an expected probability for the preferred confidence level for determining or comparing groups of test data.

The hypotheses is the standard deviation, (sigma), of a normal population is equal to a specific value of a standard or reference sigma value; center line.

The formula with degrees of freedom is ...

(n - 1)s2
X2  =


For additional information, see the National Institute of Standards and Technology's page titled Critical Values of the Chi-Square Distribution.

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Last Updated: Monday, 06-Mar-06 04:04:23 PST