Chi square test is a kind of hypothesis test that the distribution of statistics approximately obeys the chi square distribution when the zero hypothesis is established. In the absence of other restrictions or instructions, chi square test generally refers to Pearson chi square test. In the general application of chi square test, researchers divide the value of observation into several mutually exclusive categories, and use a set of theory to try to explain the probability distribution model of the value of observation falling into different categories.<br>
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