Unverified50% confidenceFactExact time
Pew's ATP design effect typically ranges between 1.5 and 2.5, meaning that a survey with a nominal sample size of 1,000 may have an effective sample size of only 400–667.
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50%
Confidence
Long-term
Relevance
8/4/2026
First Seen
Sources
误差范围是什么意思？教你正确解读民调数据的准确性
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