For a chi-square test of a contingency table, the expected frequencies for each cell are calculated assuming the two events are independent of one another.

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This is true. The expected frequencies for each cell in a contingency table are calculated based on the assumption that the two events are independent. The chi-square test compares the observed frequencies in each cell to the expected frequencies to determine if there is evidence of a significant association between the two events.

For a Chi-Square Test of a Contingency Table, the Expected