木同学2022-11-16 17:47:08
为什么选B
回答(1)
Evian, CFA2022-11-16 18:07:50
ヾ(◍°∇°◍)ノ゙你好同学,
Stratified random sampling (known as proportional random sampling or quota random sampling) involves the division of a population into smaller sub-groups known as strata. The strata are formed based on members´ shared attributes or characteristics such as income or educational attainment.
分层抽样:一个总体分分组,每个组抽抽样,例如,调查中国人的平均收入,此时如果只在中关村附近抽样很可能样本均是高收入,此时可以按照不同的地区抽样,这样的方法可以使得样本中的个体差异化较大,估计总体时更为准确。
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