问题
单项选择题
An analyst does research about sampling. Compared to estimates of parameters produced from simple random sampling, estimates of parameters produced from stratified random sampling most likely have:
A. less precision.
B. the same precision.
C. greater precision.
答案
参考答案:C
解析: 分层随机抽样比简单随机抽样要更加精确,因为在每个分层中各个个体被抽到的比例仍然保持一致,但是可以涵盖总体中的各个层次,所以减少了数据的遗漏。