That means that you can go through twenty years of a career on Wall Street and all you've observed is observations in the central region.

这就是说,你在华尔街混了二十年,所有观察值都集中在中心区域

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I'm going to have each observation as a year.

将每一年的数据作为一个观察值

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They depend on who is looking at the vector.

它们的值依赖于矢量的观察者

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Central tendency is a measure of the center of a probability distribution of the-- Central tendency is a measure-- Variance is a measure of how much things change from one observation to another.

集中趋势用以描述,一组概率分布的中心,集中趋势...,而方差衡量的是,各个观察值之间的变化

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When we have n observations it's just the summation i = 1 to n of 2/n.

当有n个观察值,这就是在i取1到n时,x减去x均值的平方,除以n的累加

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So we're talking about an experiment when you generate-- Each experiment generates both an x and a y observation and we know when x is high, y also tends to be high, or whether it's the other way around.

这里说的是由试验产生的,每一次试验可以获得一组x与y的观察值,当x值大的时候,y值可能也大,或者相反

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