Random surveys.
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stratified random sampling surveys 分层随机抽样调查
His team conducts random surveys constantly.
他的团队不断地进行随机调查。
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The National Federation of Independent Business (NFIB) conducts monthly surveys of a random sample of its 350, 000 members.
FORBES: Is The Jobs Market Really Improving?
Based on actual surveys and interviews with a random sample of debtors, the profs estimate that in 2003, at least 259, 000, or 15.7% of all bankruptcies, were really business-related.
FORBES: Small-Biz Bankrupts, Beware
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