Let's look at a sample problem.

让我们看一个示例问题。

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Let's put a generator to work in our sample problem.

让我们使生成器工作在我们样本问题中。

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OK. So there's another sample problem with the notes, which is sort of like a standard problem.

讲义上有一些其他的问题，这些问题是一些标准问题。

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Mr Heckman confronted the sample-selection problem: in terms of the examples just given, for instance, the effect on the results if the workers who answered the questionnaire differed in important ways from those who did not.

ECONOMIST: Economics focus

Startups with fewer than 30 employees will be able to submit competition proposals describing their data problem and providing a sample of their data.

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With his new site, Norgard wants to solve the problem of having to sample millions of online videos to find the ones you actually want to watch.

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