Knowing the basics of populations, sampling, and statistical significance will help you to understand what's possible, and to better understand and interpret what the results mean.

了解人口、采样和统计意义的基本知识，将有助于您理解有哪些可能性，更好地理解和解释结果的含义。

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That doesn't mean you can expect to see Darpa researchers walking down every block with chemical-sampling canisters any time soon.

这并非意味着你将很快能看到DARPA的研究员们在每个街区走来走去，手里拿着化学品采样的小罐子。

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This paper deals with the estimation of population mean in systematic sampling by use of auxiliary information in order to improve the accuracy of the estimate.

讨论了等距抽样中，如何利用辅助信息改进总体平均值的估计，以达到提高估计精度之目的。

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However, the researchers said that despite a lower number of invasive tests, the heavier reliance of this method on chorionic villus sampling earlier in pregnancy could actually mean an increase in the number of healthy babies lost if the miscarriage rate using this method was closer to 2%.

BBC: Down's test miscarriage warning