雅山中学采取分层抽样的方法从应届高三学生中按照性别抽出20名学生作为样本,其选报文科理科的情况如下表所示.
(Ⅰ)若在该样本中从报考文科的学生中随机地选出3人召开座谈会,试求3人中既有男生也有女生的概率;
(Ⅱ)用假设检验的方法分析有多大的把握认为雅山中学的高三学生选报文理科与性别有关?
参考公式和数据:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638016_ST/0.png)
p(K2≥k) | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
k | 2.07 | 2.71 | 3.84 | 5.02 | 6.64 | 7.88 | 10.83 |
考点分析:
相关试题推荐
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638015_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638015_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638015_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638015_ST/3.png)
.
(Ⅰ)求cosβ的值;
(Ⅱ)求sinα的值.
查看答案
如图,已知△ABC内接于⊙O,点D在OC的延长线上,AD切⊙O于A,若∠ABC=30°,AC=2,则AD的长为
.
查看答案
已知曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638013_ST/0.png)
(t为参数)与曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638013_ST/1.png)
(θ为参数)的交点为A,B,,则|AB|=
.
查看答案
已知cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/1.png)
,cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/2.png)
cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/3.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/4.png)
,cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/5.png)
cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/6.png)
cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/7.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638012_ST/8.png)
,…,根据这些结果,猜想出的一般结论是
.
查看答案
已知线段AB的两个端点分别为A(0,1),B(1,0),P(x,y)为线段AB上不与端点重合的一个动点,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281063839/SYS201310241835252810638011_ST/0.png)
的最小值为
.
查看答案