The variance of $\bar { Y } , \sigma _ { \bar { Y } } ^ { 2 }$ is given by the following formula:
A) $\sigma _ { Y } ^ { 2 }$
B) $\frac { \sigma _ { Y } } { \sqrt { n } }$
C) $\frac { \sigma _ { Y } ^ { 2 } } { n }$
D) $\frac { \sigma _ { Y } ^ { 2 } } { \sqrt { n } }$

Question

Quizplus · Accepted Answer

The variance of the sample mean $\bar{Y}$ is $\frac{\sigma_Y^2}{n}$, where $\sigma_Y^2$ is the population variance and $n$ is the sample size.

The Variance Of Yˉ,σYˉ2\bar { Y } , \sigma _ { \bar { Y } } ^ { 2 }Yˉ,σYˉ2​

The Variance Of $\bar { Y } , \sigma _ { \bar { Y } } ^ { 2 }$