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How to judge that the independence test does not give a critical value?
Use the credibility of the actual problem. Independence test is a statistical test method, which tests whether there is correlation or independence between two or more factors and various classifications, and can be judged by the reliability required for practical problems without giving a critical value. Critical value refers to the condition that a physical quantity must meet when an object changes from one physical state to another, which is equivalent to stagnation point in mathematics.