The margin of sampling error was plus or minus 3 percentage points.

抽样错误的差额是正负3%。

youdao

The poll of 1,288 people was conducted July 7-11 and has a margin of sampling error of plus or minus 3.5 percentage points.

这项调查于7月7日至11日之间开展，共对1288名受访者进行了访问，抽样误差率为正负3.5个百分点。

youdao

The poll of 1, 288 people was conducted July 7-11 and has a margin of sampling error of plus or minus 3.5 percentage points.

这项调查于7月7日至11日之间开展，共对1288名受访者进行了访问，抽样误差率为正负3.5个百分点。

youdao

The margin of sampling error is plus or minus 3.5 percentage points.

MSN: Poll reveals baby boomers' retirement fears

Results for the full sample have a margin of sampling error of plus or minus 3.9 percentage points, it is larger for subgroups.

NPR: 50 Years On, Finding Profit In 'Truth' On JFK Case

The sampling error varied from question to question, but none had a margin of error exceeding 4.5 percentage points.

CNN: Poll: U.S. can win war, but won't