Question

What is the margin of error for a sample statistic for a population with a standard deviation of 11.3?

Answer 1

Margin error of a sample mean is given by 
$ME=Z_{critical} \cdot \frac{\sigma}{ \sqrt{n}}$
where σ is the standard deviation, $Z_{critical}$ is the critical value and n is the sample mean.

So beside the given standard deviation, we're supposed to know the sample size and critical value to answer this question.