Koen (da-zero) (1/28/2011)
Then why is the explanation confusing? I find it pretty clear...
The explanation is "The denominator of the variance for a sample population is n - 1, resulting in division by zero."
This suggests it should give an error, and doesn't explain why it results in null instead.
I guessed wrong, but I'm not sure what the question was supposed to prove, other than if you apply a function wrongly then you get a meaningless answer!