Do I go out to Harvard yard and take a random sample of sophomores to study meditation?

是不是可以在哈佛大二学生里随机抽样来研究冥想?

You actually want to take a random sample.

你实际上想随机抽样。

How likely is a difference of means of two samples, random chance or not random chance?

两个样本的均值差异、随机机会或非随机机会的可能性有多大？

So if you take a random sample, and that's exactly what we did when we found these 7 samples.

所以如果你随机抽取样本，这正是我们在找到这 7 个样本时所做的。

And actually that works pretty well but what makes it especially hard for the pollsters is that it's hard to get a random sample.

实际上效果很好，但对民意测验者来说特别困难的是，很难获得随机样本。

The most significant would be for random sampling because, of course, in order to take a random sample, after all, you need random numbers.

最重要的是随机抽样， 因为当然，为了随机抽样，毕竟你需要随机数。

So what z is, z is a random variable where you're taking n samples from this distribution up here, this population distribution, taking its mean.

那么 z 是什么，z 是一个随机变量， 你从这里的这个分布中抽取 n 个样本， 这个人口分布， 取它的均值。

So what you do is you survey a random sample of that population and then you can calculate statistics on that sample that hopefully can estimate the population as a whole.

所以你要做的是调查该人口的随机样本，然后你可以计算该样本的统计数据，希望可以估计整个人口。

Those are the five people that I'd sample, and we could talk more about what's a good way to generate a random sample from a population so it's not skewed one way or the other.

那是我要抽样的五个人，我们可以更多地讨论什么是从人群中生成随机样本的好方法， 这样它就不会偏斜。