这道题的b选项说的是systematic sample嘛

问题如下：

The best approach for creating a stratified random sample of a population involves:

选项：

A.

drawing an equal number of simple random samples from each subpopulation.

B.

selecting every kth member of the population until the desired sample size is reached.

C.

drawing simple random samples from each subpopulation in sizes proportional to the relative size of each subpopulation.

解释：

C is correct.

Stratified random sampling involves dividing a population into subpopulations based on one or more classification criteria. Then, simple random samples are drawn from each subpopulation in sizes proportional to the relative size of each subpopulation. These samples are then pooled to form a stratified random sample.

分层随机抽样涉及根据一个或多个分类标准将总体划分为子总体。 然后，从每个子群中抽取简单的随机样本，其大小与每个子群的相对大小成正比。 然后合并这些样本以形成分层的随机样本。