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When you get--this is Rituparna, counting the leaves on a tree-- you can estimate, from a sample, the population expected values.
如果你...像数叶子的睿都巴若那一样,只有部分样本的话,你可以来估计总体均值
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There's also another variance measure, which we use in the sample-- There's also another variance measure, which is for the sample.
还有另一个离散指标,我们用以考察样本,这是另一个离散指标,用于考察样本
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There's another sample which is in Russia, part of the former Soviet Union, where there are samples that were stored.
另一个样本在俄罗斯,前苏联的一部分,那也有储存的样本
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So in the numbers game this is the spreadsheet -- or an example of this is the spreadsheet.
这就是数字游戏的电子表格,或者说这是其电子表格的一个样本
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So what researchers do is they hope to get enough people in a sample, where overall, you hope to be capturing normal intake.
所以研究者做的是,让尽可能多的人群进入样本,总体上你就可以得到正常的摄入量了
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Well, let me come up with a sample set of elements here and let me go ahead and just get some fresh white board space.
下面我用一个元素的样本集来说明,我先找一些可用的白板空间。
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in both groups: the 250 here versus 250 here, which is significant sample size.
在这两组之间，样本规模相同的两组间。
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Again, this is in a prototype level right now.
再次申明，现在,这还处于实验的样本阶段。
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Do they get sample bottles coming in?
他们一开始就得到了样本瓶了吗？
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We can define it in a couple of different ways depending on whether we're talking about sample mean or population mean.
我们有几种不同的方式去定义这个概念,取决于我们指的是,样本均值还是总体均值
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Some of the sampled denied having any religion at all-- said they have no religion at all.
样本中有些人声称自己并无宗教信仰,那些无神论者
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The absence of this smaller region tells you that this sample came from a sickle patient.
小片段的缺失就能告诉你,该样本是取自病人的
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There are still some active smallpox virus specimens kept in the world, and there are two sources of small--two places where smallpox is stored now.
世界上仍有地方保存着,一些具有活性的天花病毒样本,有两个地方还储存着天花病毒样本
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So we started collecting cereals and things like that from various countries, and found in this preliminary study, that it was the case, the American foods were sweeter.
我们从全球各地,收集了一些麦片之类的样本,研究发现,情况确实如此,美国的食品相对要甜一些
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Roger Ibbotson took a look at a larger group of funds -3,500--funds over a ten-year period and found survivorship bias at 2.9% per year and backfill bias at 4.6% per year.
罗杰·伊博森研究了更大的样本组,3500支基金10年间的表现,算出其生存偏差是每年2.9%,回填偏差是每年4.6%
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This particular example of a plasmid has several regions.
这个特定的质粒样本有数个区域
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It's the truth, but there are also sample means.
这些是真实的值,但同时也有样本均值
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whether it was the mental health workers, whether it was the philosophers,psychologists, praise the program as the best,as highly effective, when they looked at the raw objective data, the results were shocking.
无论是心理健康学者，哲学家，心理学家，都说这是最佳，最高效的研究方案，但当他们看到原始的样本数据，调研结果让他们震惊。
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And the other thing you can do is take self reports like the ones you're doing, hopefully do enough of them, and a random enough sample of the population, that you can extrapolate from that sample to the whole population, and try to estimate what people are eating in that way.
还有其他可以做的,比如大家正在做的这种个体调查,希望能把它做的充分些,如果有充足的随机样本,就可以从样本推断出,整个总体,从而推断哪类人有这样的饮食习惯
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One is in the U.S.at the Centers for Disease Control, where there is a sample of variola, which is kept, you know, frozen on ice in a heavily guarded facility.
一个在美国的疾病控制中心,那有一支天花病毒的样本,冰冻后置于重重保护之下
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I got to get a better demo.
我得找个更好的样本了
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The idea is then that autistic individuals suffer from what he calls extreme male brains, and as such, it stands to reason that they'd be more sampled from the male population than the female population.
孤独症个体,患有伯龙所谓的极端男性大脑,该理论就解释了患者样本中,男性数量要多于女性数量的原因
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That is the sample variance.
这就是样本方差
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This is very important,which is why I am doing it: "If we want to know how fast a human being can run, then it is no use to average out the speed of a "good sample" of the population; it is far better to collect Olympic gold medal winners and see how well they can do.
这话非常重要，是我作这个研究的原因：,“如果想知道人类最快能跑多快，那从好的样本中测出平均数是“,没用的;,而应该收集田径类奥运冠军的信息,看他们能跑多快。
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Covariance is--we'll call it--now we have two random variables, so cov... I'll just talk about it in a sample term.
协方差是...我们有两个随机变量,x和y的协方差是,从样本的角度来说
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You can also use PCR to identify specific genes that are present in a biological sample.
你也可以利用PCR技术去识别,一个生物样本中的某段特定基因
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ll look at research and read research about other people, about large sample sizes.
当然你们可以看和阅读关于别人的研究，Of，course，you’,有大量的样本。
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Looking at this particular group, he estimated survivorship bias to be 4.4% per year and backfill bias to be 7.3% per year.
分析这个特定的样本,他估算其生存偏差每年达到4.4%,回填偏差每年达到7.3%
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