The number of degrees of freedom (df) for a chi-square test in a 3×2 contingency table is:

• A 2 ✓
• B 3
• C 4
• D 6

Explanation

Degrees of freedom for a chi-square test in a contingency table = (number of rows – 1) × (number of columns – 1) = (3–1) × (2–1) = 2 × 1 = 2. For a 2×2 table, df = 1; for a 4×3 table, df = 6. The chi-square test assesses association between two categorical variables and compares observed with expected frequencies.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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