selection bias

例句：

1. 1. The study found that the selection bias in the sample could have affected the results.
   研究发现样本中的选择偏差可能影响了结果。
2. 2. The researcher acknowledged that the selection bias might have influenced the findings.
   研究者承认选择偏差可能影响了研究结果。
3. 3. To ensure objectivity, researchers must be aware of and avoid selection bias.
   为了确保客观性，研究人员必须意识到并避免选择偏差。