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4.概率分布类型在数理统计理论中有一条非常重要的定律,叫做中心极限定律.它用严格的数学步骤证明,如果变量ζ是由许多互相独立的偶然因素相加的结果,而这些因素对ζ的影响没有一个是非常显著的,即设:ζ=α+β+……+ε+……而α、β、ε均为起伏不很显著的变量,则ζ服从正态分布规律.正态分布的一些基本特点已在上期中作了介绍.例如上期例子中对同一个均匀试料作多次重复的化学分析,其结果必定服从正态分布规律.因为每次分析结果
4. Types of Probability Distribution There is a very important law in mathematical statistics theory called the central limit law, which is proved in strict mathematical steps if the variable ζ is the result of adding together many mutually independent contingent factors ζ is not a very significant effect, that is: ζ = α + β + ... + ε + ... ... and α, β, ε are ups and downs are not very significant variables, then ζ obey the normal distribution law Some basic features of the state distribution have been introduced in the previous issue, such as the chemical analysis repeated multiple times for the same uniform sample in the previous example, the result must follow the normal distribution law, because each time the analysis result