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
The standard detion of means measures? 
Select and explain. 
A. Non - sampling errors, B. Sampling error, C. random errors, D. Conceptual errors
B: Sampling error
Answer: B: Sampling error 
Explanation: Ref: Parks 23rd edition pg 850 The standard detion of means is a measure of sampling error It is given by the formula SD/ROOT OF RANDOM SAMPLE.