确定样本含量,是统计学调查实验设计的主要内容之一。样本含量不足,达不到应有的精度;样本含量过多,又会造成人力物力和时间的浪费。样本含量可凭估计,计算或查表确定,但这些方法或失之过粗,或应用不便。图 Determining the sample content is one of the main contents of the statistical investigation experimental design. The lack of sample content can not reach the required accuracy. Excessive sample content will result in waste of manpower and material resources and time. The sample content can be determined by calculations, calculations or checklists, but these methods are either too crude or inconvenient to apply. Figure