00:01
So the reference point for the standard deviation, which is a measure of variation, the reference point for the standard deviation is the mean.
00:13
So if we have all of our data lined up along a number line, right, and i'll just put a bunch of dots for where our data are, you know, maybe there's a bunch over here, maybe there's some over here, and there are a couple over here, right? and the standard deviation, we are trying to figure out how, far everything is away, well how far everything is away from the mean, right? so we've got a mean here, right, and the standard deviation tells us the average distance away from that.
00:48
Basically, right, standard deviation tells us, and i'll write this down, it tells us the, i'm going to put average in quotes because it's not an exact mathematical average, but conceptually average is a useful way of thinking about it...