The average margin of error is around 3%.

平均误差幅度在3%左右。

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The telephone poll's margin of error is plus or minus 4 percent.

此次电话民调的误差幅度约正负为4%。

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The telephone poll's margin of error is plus or minus 4 percent.

此次电话民调的误差幅度约正负为4%。

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