在“独立性检验”中涉及两个变量的相互独立性问题,对于刚开始学习了本部分内容时,必须首先明确两个事件相互独立的的含义,并能判断两个事件是否为相互独立事件.1.事件独立的含义所谓独立,即无关联,又互不影响.对于两个事件A,B,若事件A是否发生对事件B发生的概率没有影响,这样的两个事件叫相互独立事件. In the “independence test”, the independence of two variables is involved. For the beginning of this part of the content, you must first clarify the meaning of the two events that are independent of each other, and you can judge whether the two events are mutual. Independent events. 1. The independent meaning of the event The so-called independence, that is, no association, but also does not affect each other. For two events A, B, if the occurrence of event A does not affect the probability of occurrence of event B, such two events are called mutual Independent events.