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英语翻译什么叫non-random convenience samples,这里的convenience sample是

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英语翻译
什么叫non-random convenience samples,这里的convenience sample是指什么?
英语翻译什么叫non-random convenience samples,这里的convenience sample是
non-random convenience samples
非随机简易样本
convenience sample 可以译为简易样本,也可以译为便利样本.英文解释见下:
A convenience sample is a study of subjects taken from a group that is conveniently accessible to a researcher. One advantage of this is that it is easy to access, requiring little effort and time. This sampling method suffers from a major disadvantage in that it is not an accurate representation of the population, which can skew results quite radically. Use of a convenience sample is quite popular and prevalent, however, and it can be valid under certain conditions.
再问: 可以用中文解释下吗?谢谢了!
再答: A convenience sample is a study of subjects taken from a group that is conveniently accessible to a researcher. 便利样本就是研究者取自于可以方便地访问的一个群体的课题研究。
其他的就算了吧,有定义就可以了。
再问: 非随机简易样本就是非随机的,简单的(问题数量不多的,)的样本?

这样不通啊?有点不明白啊?求大概讲述下!
再答: 非随机简易样本就是研究者取自于可以方便地访问的一个群体的非随机的样本。
随机和非随机的区别应该明白吧?