Consider a Sampling Distribution Formed Based on N = 9 $\sigma$

Multiple Choice

Consider a sampling distribution formed based on n = 9.If the standard deviation of the population of individual measurements is $\sigma$
,then the standard deviation of the population of all sample means $\sigma _ { \bar { x } }$
Equals ____.

A) $\frac { 1 } { 3 } \sigma$
B) $\frac { 1 } { 9 } \sigma$
C) $3 \sigma$
D) $9 \sigma$
E) $\frac { 1 } { 81 } \sigma$