2011是等差数列:1,4,7,10 的第( )项。
A.669
B.670
C.671
D.672
C
题目分析:易知公差为,则,令,解得。
-Would you like to see the movie tonight?
- It's the last thing I want to do.[ ]
A.I'd love to.
B.Why not?
C.Not in the least.
D.No problem.
两组独立样本连续型变量,若来自非正态总体,可采用
A.t检验B.方差分析C.正态性检验D.配对四格表的卡方检验E.秩和检验