A simple random sample of six male patients over the age of 65 is being used in a
blood pressure study. The standard error of the mean blood pressure of these six men
was calculated to be 7.8. What is the standard deviation of these six blood pressure
measurements?
(A) 2.8 (B) 3.2 (C) 14.4 (D) 19.1 (E) 46.8

Question

A simple random sample of six male patients over the age of 65 is being used in a
blood pressure study. The standard error of the mean blood pressure of these six men
was calculated to be 7.8. What is the standard deviation of these six blood pressure
measurements?
(A) 2.8 (B) 3.2 (C) 14.4 (D) 19.1 (E) 46.8

anonymous · Answer

Answer is D. But I want to know how to calculate that.

kirbykirby · Answer

$$ SE=\frac{\sigma}{\sqrt{n}}$$, SE = standard error, $\sigma$ = std. deviation