area sampling 区域抽样 群体抽样的一种形式。样本空间按区域进行划分，选定某抽样区域，如一个县、一个行 政区、一个街区，从中确定调查对象。
对这两个区域中相等数量的村庄以及大致相等数量的家庭和妇女进行随机抽样。
An equal number of villages and approximately equal Numbers of households and women were randomly sampled from both areas.
世卫组织非洲区域办事处多名流行病学家已赶赴现场协助这两个国家开展工作，同时，正向卢萨卡市运送个人保护装备(PPE)和抽样设备。
Epidemiologists from the WHO African Regional Office have arrived to assist both countries, and personal protective equipment (PPE) and sampling equipment are en route to Lusaka.
该设置用于查找 X 平方分布的抽样分布中包含尾数区域等于 alpha 断开值（0.05）的位置（或临界值）。
This setting is used to find the location (or critical value) on the Chi Square sampling distribution that includes a tail area equal to the alpha-cutoff value (0.05).
应用推荐