A.≥70% B.≥75% C.≥80% D.≥85% E.90%
A.成組設(shè)計u檢驗 B.成組設(shè)計t檢驗 C.配對設(shè)計u檢驗 D.配對設(shè)計t檢驗 E.X2檢驗
A.行數(shù)×列數(shù) B.n-1 C.N-k D.(行數(shù)-1)(列數(shù)-1) E.行數(shù)×列數(shù)-1