I'm trying to understand statistics here:
I read that the difference between the Population Standard Deviation and Sample is
The StDevP function evaluates a population, and the StDev function evaluates a population sample.
If your sample size is N.
StDev will divide by N
and StDevP will divide by N-1
1. This does not make sense. How does subtracting one item turn a data set from a whole population into a sample?
2. Which do I use when I'm evaluating my company's sales numbers. the "P" or "S"?
I guess population because I'm including the entire group of sales people in my firm?