在上一讲中,我们讨论的只是一些具体的数据,是自母体抽样后得到的子样中各个个体的具体取值,以后将称之为子样(在一组重复试验后得到的)实现值,记为(x_1,x_2,…,x_n)。但是,如果单凭这些具体的数值,对母体的进一步研究就很难进行下去了,为此,我们还必须改变一下看问题的角度。下面重新讨论一下母体,子样和抽样等概念。 In the last lecture, we discussed only some specific data, which is the specific values ​​of each individual in the subsamples obtained after sampling from the mother, and will be referred to as subsamples (obtained after a set of repeated tests). The value is denoted as (x_1,x_2,...,x_n). However, if we rely on these specific values ​​alone, it will be difficult for us to carry out further research on the mother’s body. For this reason, we must also change the perspective of looking at the problem. The concepts of maternity, sub-samples and sampling are revisited below.