This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
Which one of the following tests can be used to study ordinal date from two independence samples from a population that is not noraml distributed? 
Select and explain. 
A. The student t test, B. The wilcoxon rank sum test, C. The chi- square test, D. The one - way analysis of variance
B: The wilcoxon rank sum test
Answer: B: The wilcoxon rank sum test 
Explanation: .