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单词 standard normal distribution
例句
原声例句
可汗学院:统计学(视频版)

So let me draw that standard normal distribution.

所以让我画出标准正态分布。

可汗学院:统计学(视频版)

For a normal, or a standard normal distribution, place the following in order from smallest to largest.

对于正态或标准正态分布,请按从小到大的顺序放置以下内容。

可汗学院:统计学(视频版)

Well, by definition, the standard deviation for the standard normal distribution is 1.

那么,根据定义,标准正态分布的标准差为 1。

可汗学院:统计学(视频版)

And this is a standard normal distribution, so the mean, or you can kind view the center point right here.

这是一个标准的正态分布,所以平均值,或者你可以在这里查看中心点。

可汗学院:统计学(视频版)

And then it has a negative kurtosis, which means that it has shorter tails and smaller peaks than a standard normal distribution.

然后它有一个负峰度,这意味着它比标准正态分布有更短的尾巴和更小的峰。

可汗学院:统计学(视频版)

And let's define it as the sum of 3 of these independent variables, each of them that have a standard normal distribution.

让我们将其定义为 3 个自变量的总和,每个变量都服从标准正态分布。

可汗学院:统计学(视频版)

Because if you are sampling just once from this standard normal distribution, there's a very high likelihood that you're going to get something pretty close to 0.

因为如果你只从这个标准正态分布中抽样一次,你得到的值非常接近于 0 的可能性非常高。

可汗学院:统计学(视频版)

Let me define a new random variable Q that is equal to-- you're essentially sampling from this the standard normal distribution and then squaring whatever number you got.

让我定义一个新的随机变量 Q,它等于——你实际上是从这个标准正态分布中抽样,然后对你得到的任何数字进行平方。

可汗学院:统计学(视频版)

So a standard normal distribution is one where the mean is-- sorry, I drew the standard deviation-- is one where the mean, mu for mean, is where the mean is equal to 0, and the standard deviation is equal to 1.

因此, 标准正态分布的均值是— — 抱歉,我画了标准差— — 均值 mu 表示均值等于 0, 标准差等于 1。

随便看

 

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