劉同學(xué)
2024-07-22 21:08The best approach for creating a stratified random sample of a population involves: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.老師AB為什么不對(duì)
所屬:CFA Level I > 數(shù)量+金融計(jì)算器前導(dǎo) 視頻位置 相關(guān)試題
來源: 視頻位置 相關(guān)試題
1個(gè)回答
葛王璐助教
2024-08-06 20:44
該回答已被題主采納
同學(xué)你好,分層隨機(jī)抽樣是將總體根據(jù)一定的規(guī)則分成若干個(gè)層級(jí),在每個(gè)層級(jí)中隨機(jī)抽取一定數(shù)量的樣本,而由于每一個(gè)層級(jí)本身可能就有數(shù)量的差異,所以樣本的數(shù)量要和總體的情況越相近越好,即每個(gè)層級(jí)里的樣本大小需要與這個(gè)層級(jí)在總體中的大小成正比,所以A、B其實(shí)都是抽取等量的兩本
