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This paper revisits the Pearson Chi-squared independence test. Afterpresenting the underlying theory with modern notations and showing new way ofderiving the proof, we describe an innovative and intuitive graphicalpresentation of this test. This enables not only interpreting visually the testbut also measuring how close or far we are from accepting or rejecting the nullhypothesis of non independence

Seven proofs of the Pearson Chi-squared independence test and its graphical interpretation