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
Which of the following statements about confidence limits/ interval is true- 
Select and explain. 
A. Smaller the confidence level larger will be the confidence interval, B. Less variable the data, wider will be the confidence interval, C. Sample size does not affect the confidence interval, D. 95% confidence interval will cover 2 standard errors around the mean
D: 95% confidence interval will cover 2 standard errors around the mean
Answer: D: 95% confidence interval will cover 2 standard errors around the mean 
Explanation: .