A two-sample t-test is planned to compare mean haemoglobin levels between two groups. The data in one group is found to be heavily right-skewed with outliers. What is the MOST appropriate alternative?
- A Chi-square test
- B Paired t-test
- C Mann-Whitney U test ✓
- D Pearson correlation
Correct answer: C. Mann-Whitney U test
Explanation
The Mann-Whitney U test (Wilcoxon rank-sum test) is the non-parametric alternative to the independent-samples t-test and is appropriate when data are skewed or have outliers violating normality assumptions. Chi-square is used for categorical data, paired t-test for matched continuous data, and Pearson correlation for linear relationships.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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