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众所周知,地下水化学成分的形成,经历了复杂而漫长的自然历史过程,受到多种多样偶然因素的影响和制约。因此从统计学观点出发,可以把地下水中各种化学离子的含量看作随机变量。假如在某地下水研究区,我们采用随机抽样的取样方式,其取样井点的空间分布则是均匀或比较均匀的,所得到的一批水样化学分析资料即为随机样本。对任一随机抽取的地下水样品,其各种离子的含量,当然是不确定的或随机的。在这些前提之下,地下水中各离子含量总体的
As we all know, the formation of groundwater chemical composition has experienced complicated and long process of natural history, which is influenced and restricted by a variety of contingent factors. Therefore, from a statistical point of view, we can regard the content of various chemical ions in groundwater as a random variable. If a groundwater research area, we use a random sampling method, the sampling well point of the spatial distribution is uniform or more uniform, the resulting batch of water samples of chemical analysis is a random sample. For any randomly sampled groundwater sample, its various ion levels are, of course, indefinite or random. Under these preconditions, the total content of each ion in groundwater