This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Tests, Subject name: Social & Preventive Medicine
Chi-square test is used for 
Select and explain. 
A. Comparing percentage, propoions & fractions in paired data, B. Comparing percentage, propoions & fractions in two or more different group of individuals, C. Comparing percentage, propoions & fractions in matched paired data, D. Comparing percentage, propoions & fractions in two unpaired samples
B: Comparing percentage, propoions & fractions in two or more different group of individuals
Answer: B: Comparing percentage, propoions & fractions in two or more different group of individuals 
Explanation: - Chi-square test is used for comparing percentage, propoions & fractions in two or more different group of individuals. - Degree of freedom = - more accurate