This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Errors, p-value, Subject name: Social & Preventive Medicine
To see if sample mean is an accurate estimate of Population mean, we use: 
Select and explain. 
A. Geometric mean, B. Range, C. Detion, D. Standard error
D: Standard error
Answer: D: Standard error 
Explanation: Standard error: Gives detion of each sample mean from population mean. Sample mean is known as Statistic. Population mean is known as parameter.