A case in point is the study by Linda Sax at UCLA, who used data from a large national survey of college freshmen to evaluate the effect of single-sex versus coeducational high schools.

加州大学洛杉矶分校的琳达·萨克斯的研究就是一个恰当的例子，她利用了一项全国性的大一新生调查来评估单性别高中和男女混合高中的效果。