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平均数的可信限前已指出,用样本平均数去估计总体平均数难免会有抽样误差,也就是说不可能估计得十分准确。为了防止因估计不准造成错觉,带来损失,可以估计总体均数大概在什么样的范围之内,即根据已知条件和倌度,确定一个区间的上、下限,而估计总体均数大概在此区间内,称为区间估计,这种上、下限称为可信限。正确理解可信限的含义离不开分布的概念,特别
It has been pointed out before the confidence limit of the averages that it is inevitable to have sampling errors to estimate the population averages by means of the sample averages, that is to say it can not be estimated very accurately. In order to prevent the misjudgment and loss caused by the misjudgment, we can estimate the approximate range of the population mean, that is, determine the upper and lower limits of an interval according to the known conditions and degrees, and estimate the population mean In this interval, called the interval estimation, this upper and lower limits known as the credible. Correct understanding of the meaning of credible limits can not be separated from the concept of distribution, in particular