A.多級(jí)抽樣 B.整群抽樣 C.分層抽樣 D.系統(tǒng)抽樣 E.簡(jiǎn)單抽樣
A.20 B.10 C.5 D.2 E.資料不足,不能計(jì)算
A.89% B.0.3% C.1.2% D.90% E.75%