A researcher wants to compare mean blood pressure before and after an intervention in the SAME group of 30 patients. Which statistical test is MOST appropriate?
- A Paired t-test ✓
- B Unpaired t-test
- C Chi-squared test
- D ANOVA
Correct answer: A. Paired t-test
Explanation
Paired t-test is used to compare means of two related measurements from the same subjects (before-after design), as observations are not independent. Unpaired t-test compares two independent groups. Chi-squared test is for categorical data. ANOVA is used when comparing means across three or more groups.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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