A.過(guò)濾性問(wèn)題B.相倚性問(wèn)題C.相關(guān)性問(wèn)題D.相互性問(wèn)題
A.最大差異抽樣B.極端案例抽樣C.方便抽樣D.機(jī)會(huì)抽樣
A.分層抽樣B.目的抽樣C.系統(tǒng)抽樣D.簡(jiǎn)單隨機(jī)抽樣