I need some help understanding sampling distributions. Here's the Q: Prepare the sampling distribution x-bar of a random sample of n=2 drawn without replacement from a finite population of size n=5, whose elements are the numbers 3,5,7,9,11. Is the mean (mu x-bar) and unbiased estimator of mu? So far I figured E(x-bar)=7. But I'm not sure how to determine the rest? Is there a formula I need for unbiased estimators? I know there aren't too many taking AP stat out here, so ANY help would be great!!