The Greek letter chi (lower case): χ which is very similar to X except the forward stroke is curved at each end. It is part of unicode, found in Microsoft Word and other programs, symbol number 03C7.
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The chi-square test is pronounced "keye-skwair" test.
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Critical values of a chi-square test depend on the degrees of freedom.
it has reproductive property
Chi-Square Goodness-of-fit Test is used when you want to test if the sample observed follows an assumed theoretical distribution.