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"A. The chi-square test is used to determine if there's a significant association between two categorical variables. It helps to see if the observed frequencies (counts) of events differ from the expected frequencies if the variables were independent."
<https://www.analyticsvidhya.com/blog/2019/11/what-is-chi-square-test-how-it-works/?utm_source=reading_list&utm_medium=https://www.analyticsvidhya.com/blog/2023/08/etl-vs-elt/>