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
[{'content': "In a study to determine relationship between presence of I.H.D and smoking, the appropriate Statistical test is \nSelect and explain. \nA. Z-test, B. Paired 't' test, C. Chi-square test, D. None of the above", 'role': 'user'}, {'content': "Answer: C \nExplanation: CHI-SQUARE TEST Chi-square (x2) Test offers an alternate method of testing the significance of difference between two propoions. It has the advantage that it can also be used when more than two groups are to be compared. Steps (1) TEST THE 'NULL HYPOTHESIS' (2) APPLYING THE x2 TEST (3) FINDING THE DEGREE OF FREEDOM (4) PROBABILITY TABLES Ref : Park 23rd edition Pgno : 852", 'role': 'assistant'}]