The survey has a margin of error of 2.5%.

测量的误差幅度为2.5%。

《牛津词典》

In addition to sampling error, the practical difficulties of conducting any survey of public opinion may introduce other sources of error into the poll.

除了样本误差外，全国性的公众意见的调查操作上的困难也会导致误差。

youdao

The survey has a total margin of error of plus or minus 2.6 percentage points, larger for subgroups.

该调查错误率是加上或减去2.6%，对次级群组错误率幅度更大。

youdao

The margin of error for the survey is plus or minus 4.5 percentage points.

CNN: Round 1 in debates goes to Obama, poll says

The survey had a sampling error of plus or minus 3.1 percentage points.

CNN: Analysts pore over 'ambiguous' Iran results

The survey had a sampling error of 4.5 percentage points.

CNN: Kerry decides against 2008 presidential run