今天看到一篇文章，大致：实验样本是从一个旅游网站注册会员中随机抽取的（排除了工作人员及相关人员），文中作者说“the respondents' characteristics were compared to the characteristics of the overall panel membership and no significant differences were found, suggesting that respondents are reprensentative of the overall panel members”。大牛们，请问作者他是怎么做到的啊（关于具体方法 结果什么的没说）？跪谢啊[em23][em23]