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': "All are true regarding students t-test, except- \nSelect and explain. \nA. Standard error of mean is not estimated, B. Standard population is selected, C. Two samples are compared, D. Student's t- test map is required for calculation", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref:Parks 23rd edition pg 852 Student T test requires mean and SD Tests of significance: Qualitative: Chi- square : 2 or more than 2 groups Mc Nemar test : 1 group. ( before and after intervention) Quantitative: Paired T test: 1 group Student T test/ unpaired T test: 2 groups Anova: more than 2 groups.', 'role': 'assistant'}]