Ononot — In a 2 \times 2 contingency table with counts a, b, c, d, wh

Inferential Statisticshard

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In a $2 \times 2$ contingency table with counts $a, b, c, d$ , what is the primary limitation of the Pearson Chi-squared test when all cell counts are very small (e.g., all $\le 5$ )?