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
All of the following are nonparametric test, except: 
Select and explain. 
A. Chi-square test, B. Z-test, C. Wilcoxon Rank sum test, D. Kruskal-Wallis 'H' test
B: Z-test
Answer: B: Z-test 
Explanation: Ans. b. Z-testRef: Parks Text book of Preventive and Social Medicine, 24th Ed; Page No-274-75 PARAMETRIC AND NONPARAMETRICTESTS Parametric testsNonparametric testsBased onGaussian/Normal distributionsNon-normal distributionsType of dataQuantitativeQualitativeComparesMeans (+SD)Percentage, proportions and fractionsExample*. Students (Paired) t-test*. Students (Unpaired) t-test*. ANOVA F-test*. Sign test*. Chi-square test*. Wilcoxon Rank sum test*. Wilcoxon signed Rank test