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.

我最近发表一项研究通过追踪一个关键时期内全国随机抽取大量美国样本回答了这个问题，在这个时期，体型从青少年形态转变为成形态，同时也建立自我身份时期。

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

如果我随机抽取 100 万个数学专业，其中肖像画家子集可能相对较小。

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.

我随机选取江苏省某典型公立中学青少年作为样本，认为这一群体可以代表中国城市青少年。

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，而这正我在找到这7个样本时所。

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

当我取这7个样本并计算它均值时，这个均值可以被视为来自抽样分布一个随机样本。

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，所以这不一个随机样本。 如果你一直表现良好，任何合理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.

所以圣克拉拉研究中， 我采用了这种Facebook抽样方案，这并不理想方法，但在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.

这些横断面调查, 自我报告, 没有非运动员对照组, 也不运动员随机样本。

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，如果你问法学院学生， 至少我公司法课程里学生，这并不一个随机样本， 也不科学调查。

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名一年级学生成长历程，这些学生随机选取自巴尔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.

这些都我要抽样五个，我可以进一步讨论如何生成一个不偏不倚总体随机样本。

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.

我有信心，随机选取样本均值x有99%概率落在——让我用计算器算出这个值。

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.

，我知道那里也有很多国际学生，但我认为从校园里外国学生中随机抽取样本可能会给我更好答案。

How do we create a random sample?

我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，你所对那部分群进行随机抽样调查，然后基于这个样本计算统计数据，期望这些数据能够整体估算出该群情况。

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，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.

美国疾病防治中心一名顾问表示，献血者不群中随机抽取样本。

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

不可以在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方法。