An investigator wants to compare the distribution of blood groups A, B, AB and O among 200 medical students against the known national distribution of these groups. The most appropriate statistical test is:

• A Chi-square goodness of fit test ✓
• B Paired t-test
• C Student t-test
• D Correlation coefficient

Explanation

The chi-square goodness of fit test compares observed frequencies across categories of a single qualitative variable with expected frequencies derived from a theoretical or known distribution, here the national blood group proportions. Student and paired t-tests apply to quantitative continuous data comparing means, so they are unsuitable for categorical counts. Correlation assesses the linear relationship between two quantitative variables and has no role in testing category-wise fit.

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

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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