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
Z score is used in - 
Select and explain. 
A. Nominal data, B. Normal distribution curve, C. t test, D. Chi square test
B: Normal distribution curve
Answer: B: Normal distribution curve 
Explanation: 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.