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': 'Z score is used in - \nSelect and explain. \nA. Nominal data, B. Normal distribution curve, C. t test, D. Chi square test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref:Parks 23rd edition pg 849 To know whether the individual value falls above or below the mean value . A random variable is said to have been standardized when it has been adjusted so that mean is zero and SD=1.', 'role': 'assistant'}]