Ononot — Suppose we have a 2 \times 2 contingency table with counts a

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Inferential Statisticshard

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Suppose we have a $2 \times 2$ contingency table with counts $a, b, c, d$ . What is the primary concern when applying the Pearson Chi-squared test to a table where all cell counts are very small (e.g., all counts $\le 5$ )?