The study took a sample survey and focus group interviews combination of empirical research.

本课题采取抽样调查和焦点小组访谈相结合的方法进行实证研究。

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A sample survey was made on the current status of school health of 561 urban and rural primary an middle school.

全国抽样调查561所城乡中小学校的学校卫生现状。

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This study is a sample survey of the mental health of junior middle school students in Wenzhou with an SCL-90 rating scale.

用SCL - 90量表对温州市初中生的心理健康状况进行了抽样调查研究。

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The analysis, based on a sample survey of voters last year, is viewed as the best source of government data on turnout by race and ethnicity.

NPR: A Census First: Black Voter Turnout Passes Whites

Yes, the listeners to the webcast were certainly not a representative sample (not that any survey nowadays is based on a representative sample) but the honest answers may have given us a good indicator of the state of IT readiness for big data.

FORBES: The Future of Big Data: Crawling Over Broken Glass?

This is based on a survey sample of 200 user enterprise IT and business leaders, along with input from about 30 vendors.

FORBES: Fastest-Growing Category of Cloud Computing: Business Intelligence and Analytics