A researcher compares mean blood pressure before and after a dietary intervention in the same 30 participants. The most appropriate statistical test to use is:
- A Independent samples t-test
- B Chi-square test
- C Paired t-test ✓
- D ANOVA
Correct answer: C. Paired t-test
Explanation
When comparing two related measurements from the same subjects (before and after), the paired t-test is used because it accounts for the correlation between paired observations, reducing variance due to individual differences. An independent t-test is used for two unrelated groups, while ANOVA is used for comparing more than two groups.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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