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
Order for the Margin of error in the graph given above is? 
Select and explain. 
A. 3>2>1, B. 3>1>2, C. 1>3>2, D. 1=2=3
A: 3>2>1
Answer: A: 3>2>1 
Explanation: (a) 3>2>1* Margin of Error: Amount of random sampling error in a survey's results* Margin of error is simply the "radius" (or half the width) of a confidence interval* Margin of error = Critical value x Standard error* Standard error is inversely related to sample size (SEmean = SD/[?]Sample size)* Margin of error is inversely related to the Sample size