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关注：1
2013-05-23 12:21
求翻译：To examine for non-response bias, the responses from the first 20 returns (30 per cent) and those from the last 20 were compared to test if responses differed between the two groups是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
To examine for non-response bias, the responses from the first 20 returns (30 per cent) and those from the last 20 were compared to test if responses differed between the two groups
问题补充： |
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