Sample Variance: Why the (n-1)? Understanding Bessel's Correction

This is NOT a proof of Bessel's correction. Instead, we explore several ideas to help you understand why the "n-1" makes sense. It boils down to the fact that we (usually) don't know the population mean when we are estimating the variance.
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1:52 Overview of the Pieces we will explore
6:10 Sample means minimize the formula
15:11 Simulations in Rstudio
20:11 Dividing by N makes estimates too small
26:50 If we know the population mean, we can divide by N!
28:40 Using Bessel Correction also gives unbiased estimates

[@gabriel10goncalves65]

could you tell me about the pick 3 lottery how many possible combinations could we do could you give me that calculation. I would also like to know about pick 4, also about this one. Thank you, I'm looking forward to it!

[@BurkeyAcademy]

It isn't much of a calculation: 1,000 for pick 3, and 10,000 for pick 4.

[@user-gj5ds8mo2l]

Yeah you tell em!