Chi-squared test

Chi-square distribution, showing X2 on the x-axis and P-value on the y-axis.

A chi-squared test, also referred to as $χ²$ test (or chi-square test), is any statistical hypothesis test in which the sampling distribution of the test statistic is a chi-square distribution when the null hypothesis is true. Chi-squared tests are often constructed from a sum of squared errors, or through the sample variance. Test statistics that follow a chi-squared distribution arise from an assumption of independent normally distributed data, which is valid in many cases due to the central limit theorem. A chi-squared test can then be used to reject the null hypothesis that the data are independent.

单词	Chi Square test
释义	Chi Square test 英语百科 Chi-squared test A chi-squared test, also referred to as $χ²$ test (or chi-square test), is any statistical hypothesis test in which the sampling distribution of the test statistic is a chi-square distribution when the null hypothesis is true. Chi-squared tests are often constructed from a sum of squared errors, or through the sample variance. Test statistics that follow a chi-squared distribution arise from an assumption of independent normally distributed data, which is valid in many cases due to the central limit theorem. A chi-squared test can then be used to reject the null hypothesis that the data are independent.
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Chi Square test

Chi-squared test