[danzasmack]

I may not be 100% correct here but...

You have a sample of data which you use to calculate a statistic - BB/100

Let us assume you BB/100 = 2.0 for simplicity.

Now, a question on this forum is very often "am i a winning player?" The SD/100 can help us calculate it.

We want to estimate the mean so we will use SE of the Mean, which in this case = (SD/100)/(n^.5)= 51/(16000^.5) = .40 (about)

So, for 99% confidence interval we do 3 SD's from the mean, so we are 99% sure that your TRUE BB/100 is in the interval [.8, 3.2]

(assuming your BB/100 is 2)