![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
已知全集U={x-1<x<9},A={x1<x<a},A是U的子集,若A≠∅,则a的取值范围是()
A.{aa<9}
B.{aa≤9}
C.{aa≥9}
D.{a1<a<=9}
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
D、{a1<a<=9}
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.{aa<9}
B.{aa≤9}
C.{aa≥9}
D.{a1<a<=9}
D、{a1<a<=9}
设全集为U=R,集合A={x|x≥-2},集合B={x|x<3},则CvA∩B的集合为
A.{x|-2≤x<3}
B.{x|x≤-2}
C.{x|x<3}
D.{x|x<-2}
已知样本均值=5,求参数p的置信水平为95%的置信区间。
A.经过第一、二、四象限
B.与x轴交于(1,0)
C.与y轴交于(0,1)
D.y随x的增大而减小