Our recently published study answered this question by tracking a large national random sample of Americans over a critical time period when bodies change from teenage shape into adult form and when people build their identities.

我们最近发表的一项研究通过追踪一个关键期内全国随机抽取的大量美国人的样本回答了个，个期，人们的体型从青少年形态转变为成人形态，同也是人们建立自我身份的期。

If we took a random sample of a million people who majored in math, the subset who are portrait artists might be relatively small.

如果我们随机抽取 100 万个数学专业的人，其中是肖像画家的子集可能相对较小。

We chose a random sample of teenagers from Jiangsu province from a typical public middle school, and we considered this group to be representative of teenagers in urban China.

我们随机选取江苏省某典型公立中学的青少年作为样本，认为一群体可以代表中国城市的青少年。

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

所以如果你抽取一个随机样本，而正是我们找到7个样本所做的。

When we took these 7 samples and took their mean, that mean can be viewed as a random sample from the sampling distribution.

当我们取7个样本并计算它们的均，个均可以被视为来自抽样分布的一个随机样本。

And it turns out, since you use five packs, so it isn't a random sample, if you've been doing well, any sensible updating will say you're going to do worse in the future.

结果表明， 由于你使用了五包，所以不是一个随机样本。 如果你一直表现良好，任何合理的更新都会预测你未来表现会变差。

So the Santa Clara study, we did this Facebook sampling scheme, which is, I mean, not the ideal thing, but it was very difficult to get a random sample during lockdown.

所以圣克拉拉的研究中， 我们采用了种Facebook抽样方案，并不是理想的方法，但封锁期间很难获得随机样本。

These were cross-sectional surveys, self-report, with no non-athlete control groups, and they weren't random samples of athletes.

些是横断面调查, 自我报告, 没有非运动员对照组, 也不是运动员的随机样本。

Well, if you ask law students, at least in my corporate law class, which is not a random sample, this is not scientific.

好吧，如果你法学院的学生， 至少是我公司法课程里的学生，并不是一个随机样本， 也不是科学的调查。

In 1982, American sociologists Karl Alexander and Doris Entwisle began following the lives of a random sample of 800 first grade students growing up in a variety of neighborhoods in the Baltimore area.

1982年，美国社会学家卡尔·亚历山大和多丽丝·恩特威斯尔开始追踪800名一年级学生的成长历程，些学生随机选取自巴尔的摩地区各种不同社区。

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.

些都是我要抽样的五个人，我们可以进一步讨论如何生成一个不偏不倚的总体随机样本。

We are confident that there is a 99% chance that a random x, a random sample mean, is within-- and let's figure out this value right here using a calculator.

我们有信心，随机选取的样本均x有99%的概率落——让我们用计算器算出个。

Yes, I know there are a lot of internationals there too, but I think a random sample from foreign students on campus might give us a better range of answers.

是的，我知道那里也有很多国际学生，但我认为从校园里的外国学生中随机抽取样本可能会给我们更好的答案。

How do we create a random sample?

我们如何创建一个随机样本？

You actually want to take a random sample.

你实际上想随机抽样。

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.

因此，你所做的是对那部分人群进行随机抽样调查，然后基于个样本计算统计数据，期望些数据能够整体估算出该人群的情况。

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。

An advisor to the U.S. Centers for Disease Control says blood donors are not a random sample of the population.

美国疾病防治中心的一名顾表示，献血者不是人群中随机抽取的样本。

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

是不是可以哈佛大二学生里随机抽样来研究冥想?

BLS does this stratified random sample idea.

BLS采用了分层随机抽样的方法。