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What is Χ²- test? When can it be used? Can variables be quantitative, qualitative, or both?

What is Χ²- test? When can it be used? Can variables be quantitative, qualitative, or both?

Math   Statistics-And-Probability   
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Solution : categorical variable (Qualitative variable ).

                 The Chi-square test is used to determine whether there is significant different between the expected frequencies and observed frequencies in one or more categories .

                 Also,the chi-squre test is used to test for independence of two or more different categories.
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