The Chi-squared statistic can be used to test for association.
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Chi-square is a statistic used to assess the degree of the relationship and degree of association between two nominal variables
For goodness of fit test using Chisquare test, Expected frequency = Total number of observations * theoretical probability specified or Expected frequency = Total number of observations / Number of categories if theoretical frequencies are not given. For contingency tables (test for independence) Expected frequency = (Row total * Column total) / Grand total for each cell
Yes.
Neither. It is a test of how well the observed values agree with those predicted by the null hypothesis - whatever that might be.
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