Hey =]

This question is crucial to me passing this exam!! Please help!!

In a typical exam question you are given....

$\displaystyle n=50$

$\displaystyle \sum x=1615.0$

$\displaystyle \sum x^2=52214.50$

and because of the Central Limit Theorem...

$\displaystyle X\sim N(\mu , \frac{\sigma ^2}{n} )$

So when you use the normal distribution...which variance should you use? The unbiased one (n/(n-1))? Or the biased one?

Thanks guys!