Chisquared test facts for kids
Chisquared test (or test) is a statistical hypothesis test. It usually tests the hypothesis that "the experimental data does not differ from untreated data". That is a null hypothesis. The distribution of the test statistic is a chisquared distribution when the null hypothesis is true.
The test results are regarded as 'significant' if there is only one chance in 20 that the result could be got by chance.
There are three main groups of tests:
 Tests for distribution check that the values follow a given probability distribution.
 Tests for independence check that the values are independent; if this is the case, no value can be left out without losing information.
 Tests for homogeneity: These check that all samples taken have the same probability distribution, or are from the same set of values.
Images for kids

Chisquared distribution, showing χ2 on the xaxis and pvalue (right tail probability) on the yaxis.
See also
In Spanish: Prueba χ² para niños
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Chisquared test Facts for Kids. Kiddle Encyclopedia.