抽样误差
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sampling survey error
抽样调查误差
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The survey's sampling error is plus or minus 3 percentage points for the overall sample.
CNN: Obama seeks revisions to Afghanistan plans, sources say
The survey had a sampling error of plus or minus 3.1 percentage points.
CNN: Analysts pore over 'ambiguous' Iran results
The survey's sampling error is plus or minus 3 percentage points.
CNN: Poll: Most favor bipartisanship; Democrats, not so much
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