This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
All are non - parametric tests, except 
Select and explain. 
A. Chi - square test, B. Kruskal - wallis 'H' test, C. Z - test, D. Sign test
C: Z - test
Answer: C: Z - test 
Explanation: Parametric tests
Non parametric tests




Quantitative
Paired student t - test
Unpaired student t - test
ANOVA F - test
Z - test




Qualitative
Sign test
Chisquare test
Wilcoxan tests