A Chi-square table is used in a Chi-square test in statistics. A Chi-square test is used to compare observed data with the expected hypothetical data.
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A powerful test is the chi-square contingency table.
correlation is used when there is metric data and chi square is used when there is categorized data. sayan chakrabortty
here is answer for your question - http://www.wellesley.edu/Psychology/Psych205/chisquareindep.html
the Chi Square distribution is a mathematical distribution that is used directly or indirectly in many tests of significance. The most common use of the chi square distribution is to test differences among proportions
Chi-square