This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Social & Preventive Medicine
Quantitative test for same group of individuals before and after study is:- 
Select and explain. 
A. Paired t- test, B. Unpaired t- test, C. Z- test, D. Chi-Square test
A: Paired t- test
Answer: A: Paired t- test 
Explanation: 1. Z-test for large samples 2. t-test for small samples applied as: a. Unpaired t-test (two independent samples) b. Paired t-test (single sample correlated observations) 3. ANOVA test for 3 or more samples Parametric Tests Non Parametric Tests Based on Normal distribution Non normal distribution Type of data Quantitative Qualitative Compares Means %, Propoions, Fractions Examples Paired t-test Unpaired t-test ANOVA test Sign test Chi-square test Wilcoxan test