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.