This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, 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: Ans. a. Paired t-testTestUsePaired t-testComparing means in paired data (In same group of individuals before and after an intervention)Unpaired t-testComparing means in two different group of individualsZ-testIt is a variant of t-test which used when sample size is >30Cho-Square testComparing percentage, proportions and fractions in two or more different group of individuals