# Thread: simple i.i.d random variable query?

1. ## simple i.i.d random variable query?

If i have some independent and identically-distributed random variables and i am given their mean and standard deviation. When working out the variance of an estimator of the mean, do i have to convert the standard deviation to the variance by squaring it?

2. Originally Posted by sirellwood
If i have some independent and identically-distributed random variables and i am given their mean and standard deviation. When working out the variance of an estimator of the mean, do i have to convert the standard deviation to the variance by squaring it?