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单词 population standard deviation
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可汗学院:统计学(视频版)

And then the population standard deviation.

然后是总体标准差。

可汗学院:统计学(视频版)

The population standard deviation assuming our null hypothesis.

假设我们的原假设的总体标准差。

可汗学院:统计学(视频版)

And we always have to put a little confidence there, because remember, we didn't actually know the population standard deviations, or the population variances.

而且我们总是必须在那里放一点信心, 因为请记住,我们实际上并不知道总体标准偏差或总体方差。

可汗学院:统计学(视频版)

If you will have more than 30 samples, if your sample size is more than 30, your sample standard deviation is going to be a good approximator for your population standard deviation.

如果您有超过 30 个样本,如果您的样本量超过 30,则您的样本标准差将是总体标准差的一个很好的近似值。

可汗学院:统计学(视频版)

So the standard deviation of our sampling distribution is going to be-- and we'll put a little hat over it to show that we approximated it with-- we approximated the population standard deviation with the sample standard deviation.

所以我们的抽样分布的标准偏差将是——我们会在它上面戴一个小帽子来表明我们用它来近似——我们用样本标准偏差来近似总体标准偏差。

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