![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada365bdb9ea17d57c7bfcc033601e50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35be810816a3563353a1058fd411c676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
不合格 | 合格 | 合计 | |
男生 | |||
女生 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f503f0dec4cf2cc95ad9521c5eaf9f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.1 | 0.05 | 0.005 |
![]() | 2.706 | 3.841 | 7.879 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175af9f46a65c426f9adccb676440b6.png)
产品 | 合格 | 不合格 | 合计 |
调试前 | a | 16 | |
调试后 | b | 12 | |
合计 |
(1)求列联表中a,b的值;
(2)补充
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175af9f46a65c426f9adccb676440b6.png)
(3)常用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d83873cde08c5356f6830a65cccbe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3990c4e36b13860dcda266084cdc9f44.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38cfee12dbeeab57c707dca8643538a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.10 | 0.05 | 0.01 | 0.005 | 0.001 |
k | 2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
性别 | 关注赛事 | 不关注赛事 |
男 | 84 | 36 |
女 | 40 | 40 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ae197ece5a94e48fe6f05dea69e936.png)
(2)是否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b253ec362b46012c30d1eb2d3030ee2a.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.050 | 0.010 | 0.005 | 0.001 | |
k | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ab4b75fa22deba7fcbcdcb31dd45b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8bb034d2f94428bf12d5cf102cafef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7e436790295af4902254dad6d7365f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a4d35f02c7125868dd4ca2533325d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7035cd4adda5d72a9fc9f9fda75995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5aa584db159b0f9bfae801d0134393b.png)
(1)将复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6cce69189929b8828de24c148ac814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eed3d568acf369a315c7ab41c081049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ff131c51a4ef6745538c18cec92c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7035cd4adda5d72a9fc9f9fda75995.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b845bd1c5586735a5cfd44bab146ce.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bcff080e5e25a0e82802434e83171b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a092c1d824879e64ba3b5d2e5a6a4261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f72b70c8c5b5cb34a67c1662ef5d155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6b4e6f57926cd95e4cf365422028b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aefbe794eaa3d456d1b92d0f5ddbb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba513b97e46cd8385e8f31c62249dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4446e8a44481f53d6565ec93d6b5e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf86b36d3eacbe8d2ea19c310cb76e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2bc1ec1491880104dded7a3a3a8f9ff.png)
观点 | 高二 | 高三 |
热爱 | 30 | 20 |
不热爱 | 20 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)若根据小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f503f0dec4cf2cc95ad9521c5eaf9f18.png)
![]() | 0.050 | 0.010 | 0.001 |
![]() | 3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa088a4729226b696c536845791d4c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c305c245407e2152ef4c582dc2d3f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8901c469ca9b12a490dbb827c906215b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d52b5c676c90b24db90d977c829193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea905439d2e55ab4dcaa355eca72cbf1.png)
10.15 | 109.94 | 3.04 | 0.16 | ||||
13.94 | 11.67 | 0.21 | 21.22 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33655f889e85f295c28517e7079a3214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2038552dcd0649b737ead848dd47a061.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963b8975e1163d137d90234ba7011320.png)
(1)用相关系数说明哪种模型建立y与x的回归方程更合适;
(2)根据(1)的结果及表中数据,建立y关于x的回归方程;
(3)已知玫瑰的利润z与x、y的关系为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6dbc48d508c39b922fe66b1c5ba694.png)
参考数据和公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a2a1cc1ee4180dd681f43cb17e5217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bff34a5ad64458047d602a8f3423f73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c611e88194adf02c0c806c8497e105e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5a49a06acfed650f11eb5fe186113f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096adfb259a142cda62b51e2b08ca9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a2c503f4f65e958539a7ed809a8acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ff0671492cc8f5ae8faea92afb4c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831e3350f3665fe5baed21f64b99528b.png)
(1)找出这种商品随着大小(型号)不同而价格变化的规律;
(2)根据规律预测这种商品不同大小(型号)的价格;
(3)根据规律给消费者或生产商提出建议.
在上面的解决问题过程中,做了哪些假设?为什么这样假设?
一级品 | 二级品 | 合计 | |
A机器 | 70 | 30 | 100 |
B机器 | 80 | 20 | 100 |
合计 | 150 | 50 | 200 |
(2)能否有90%的把握认为A机器生产的产品质量与B机器生产的产品质量有差异?
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.15 | 0.10 | 0.05 | |
2.072 | 2.706 | 3.841 |
10 . 2020年5月4日,习近平总书记在北京大学师生座谈会上发表重要讲话,明确指出社会主义核心价值观充分体现了对中华优秀传统文化的传承和升华,弘扬中华优秀传统文化对培育和践行社会主义核心价值观具有重要作用.深入学习习近平总书记的讲话精神,对于正确认识中华优秀传统文化与社会主义核心价值观的关系,促进中华民族伟大复兴中国梦的实现具有重要意义.某地区开展学习国学活动,在活动开展一段时间后,该地区针对居民学习结果进行了相关的问卷调查,并将得到的分数整理成频率分布直方图如图所示.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)为了调查该地区居民对学习国学的认可度,从调查问卷中随机抽取一部分问卷,整理得到统计数据如下表:
认可开展学习国学活动 | 认为不必要学习 | 总计 | |
50岁以上 | 45 | 55 | 100 |
50岁及50岁以下 | 75 | 25 | 100 |
总计 | 120 | 80 | 200 |
根据表中数据,是否有99.9%的把握认为居民对开展学习国学活动的态度与年龄有关?
参考公式及数据:
,其中
.
0.100 | 0.050 | 0.010 | 0.001 | |
2.706 | 3.841 | 6.635 | 10.828 |