For smaller subgroups, the margin of sampling error is larger.

原始团体越小，样本得出结论的误差越大。

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

抽样错误的差额是正负3%。

The survey's sampling error is plus or minus 5 percentage points.

该项调查的抽样误差率在正负5个百分点之间。

Stratified sampling can reduce the sampling error associated with simple random samples.

分层抽样可以减少由简单随机抽样造成的抽样误差。

The national total population was adjusted for the sampling error and investigation error.

全国数据根据抽样误差和调查误差进行了修正。