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在土木建筑施工过程中对混凝上进行质量管理,常会遇到这样一个问题:一个预制厂、一个施工队或一项大工程的混凝土的生产时间很长(如半年、一年),而每种配合比的混凝土强度是按一定方式(如每月、每项工程)分别统计的,即R_i、σ_i、C_(vi),称为各子集的变量,故有时为了满足某种(每季、全年、全厂)需要,就需将m个子集的变量合并,即产生了如何用m个R_i、m个σ_i计算全集的平均强度值R_T和全集的标准差σ_T的问题。设每个子集i中有k个变量,则在每个子集中有
The quality management of coagulation during the construction of civil engineering construction often encounters such a problem: The production time of a prefab plant, a construction team or a large-scale project is very long (such as six months or one year). The concrete strength of the mix ratio is calculated according to a certain method (such as monthly, each project), that is, R_i, σ_i, C_(vi), called the variables of each subset, so sometimes to satisfy certain (per quarter For the whole year, the whole plant) needs to merge the variables of m subsets, that is, how to calculate the average strength R_T of the full set and the standard deviation σ_T of the full set using m R_i and m σ_i. Assuming that there are k variables in each subset i, there are in each subset