We have a representative sample.
我有一个代表性的样品。
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A recent study of a nationally representative sample of American students found that black students with the same standardized test scores as their white classmates were less likely to be nominated for gifted programs if they had a non-black teacher.
最近对具有全国代表性的美国学生样本进行的一项研究发现,如果黑人学生的老师不黑人, 那么与白人同学具有相同标准化考试成绩的黑人学生被提名参加天才项目的可能性较小。