That there's a lurking variable which is just that people are more likely to be born in June.

人们的研究对象之中有一个隐藏变量,那就是大多数人都是在六月出生的。

麻省理工公开课 - 计算机科学及编程导论课程节选

But then they would have to also check and make sure that June isn't just a popular month to be born, as was suggested earlier.

但是他们之后要做的是要去查看,并且确认我们之前说的，六月不是一个所有人的出生率都高的月份。

麻省理工公开课 - 计算机科学及编程导论课程节选