试题与答案

一个城市的总人口为2500万,其包含5个城区,每个城区的人口大约在500万左右,计划

题型:单项选择题

题目:

一个城市的总人口为2500万,其包含5个城区,每个城区的人口大约在500万左右,计划进行一项抽样调查,经计算可知对该城市总人口进行推断的样本量为n。如果还想分别对5个城区的人口进行精确地推断,则样本量应该是()。

A.n

B.5n

C.3n

D.不能确定

答案:

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