Statistics: Variance of a population

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I realized I made a slight error in the last video, when I talk about the population and the sample mean.

So I will rewrite the equations.

I realize I made a slight notational error, and it might have confused you a little bit.

So just to review a little bit, it never hurts.

The mean of a population-- once again, that's mu-- the mean of a population is equal to, you take the sum of each of the data points.

So you take the sum-- that's that big sigma is for-- of each of the data points.

So x sub i.

I had written x sub n, before.

And if you review that last video, you can see why might be a little confusing.

And you start with the first data point.

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