Methods Stratified random group sampling was adopted in survey.

方法采用多级随机抽样法。

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Scientists studied a random group of 10, 317 college students from their graduation in 1957 until the present day.

科学家随机抽取了10317名大学生作为研究对象，并跟踪调查了他们从1957年毕业后到现在的情况。

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Scientists studied a random group of 10,317 college students from their graduation in 1957 until the present day.

科学家随机抽取了10317名大学生作为研究对象，并跟踪调查了他们从1957年毕业后到现在的情况。

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Well, a cross-sectional study would mean that you'd get a random group of the population and measure them in 1970 and then take another random group five years later and measure them, but it wouldn't be the same people necessarily, it would be different groups of people.

那么,横断面研究就是,1970年你在人群中随意选择一组人,并记录下相关数据,然后,五年后再随意选择一组人记录数据,但这不需要是同一组人,通常是不同的人

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Here is what he did. Rosenthal went into a group of random schools.

他是这么做的，Rosenthal随便走进几间学校。

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Poll any random group of HDTV owners about what non-HD station they wanted in high-def and you'll get two stations more than any other: Sci-Fi and FX.

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Rather, that in any random group of people who happen to be good at engineering we would expect to find more men in that group than women.

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If you were to survey a random group of men about their greatest health concerns, I doubt the length of their sperm cells would even make the list.

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