![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f8672d20e2935c5ffe47d1e2a8eff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f8672d20e2935c5ffe47d1e2a8eff2.png)
月份 | 1 | 2 | 3 | 4 | 5 |
不满意的人数 | 120 | 105 | 100 | 95 | 80 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f8672d20e2935c5ffe47d1e2a8eff2.png)
(2)工作人员从这5个月内的调查表中随机抽查100人,调查是否使用这款
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f8672d20e2935c5ffe47d1e2a8eff2.png)
使用 | 不使用 | |
女性 | 48 | 12 |
男性 | 22 | 18 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f8672d20e2935c5ffe47d1e2a8eff2.png)
附:回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81da3d8bc4e503adebac5d97aa68c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f149458ffc83c8f613f84386f529f476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a5c571826d8f1f219db8015f4d05bd2.png)
0.1 | 0.05 | 0.01 | 0.005 | 0.001 | |
2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b613a51e56d1765167c7eb1cf1b056c.png)
男生 | 女生 | 合计 | |
喜欢食堂就餐 | 40 | 20 | 60 |
不喜欢食堂就餐 | 10 | 30 | 40 |
合计 | 50 | 50 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f123c7e419fd409559c85afdb19ef067.png)
(2)该校甲同学逢星期二和星期四都在学校食堂就餐,且星期二会从①号、②号两个套餐中随机选择一个套餐,若星期二选择了①号套餐,则星期四选择①号套餐的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(3)用频率估计概率,从该校学生中随机抽取10名,记其中“喜欢食堂就餐”的人数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875a413a7593078159ceda1319f965cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef133b0fd53a48310a82c18729575abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef133b0fd53a48310a82c18729575abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.1 | 0.05 | 0.01 | 0.005 | 0.001 | |
2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
飞行距离x(kkm) | 56 | 63 | 71 | 79 | 90 | 102 | 110 | 117 |
损坏零件数y(个) | 61 | 73 | 90 | 105 | 119 | 136 | 149 | 163 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208cee248d81744b6e55f8e338157f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf23eba959eca6baa20fe1aacaef0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0933e3f97007a85068f23bdb8859d97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4570f956f7b5cc3daaf66ac6ccd6fef7.png)
(1)建立y关于x的回归模型
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb66792732dd4577e83b35cb9769126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d761f43911a3f234af83484adc177c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0032ca31e3cba58f973c6e75b907fb1.png)
(2)该公司进行了第二项测试,从所有同型号推进器中随机抽取100台进行等距离飞行测试,对其中60台进行飞行前保养,测试结束后,有20台报废,其中保养过的推进器占比30%,请根据统计数据完成2×2列联表,并根据小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
保养 | 未保养 | 合计 | |
报废 | 20 | ||
未报废 | |||
合计 | 60 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34328f2e6e5c8f51ae6eba7037579b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357ee246ca9f0cd44b240879eab2470f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdd40b2feee85f117335b9f2203b60e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.25 | 0.1 | 0.05 | 0.025 | 0.01 | 0.001 | |
1.323 | 2.706 | 3.841 | 5.024 | 6.635 | 10.828 |
男生 | 女生 | 合计 | |
考试成绩合格 | 30 | 20 | 50 |
考试成绩不合格 | 10 | 20 | 30 |
合计 | 40 | 40 | 80 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953e89f7e797bf8fe9ff31e0d2f66728.png)
(2)在考试成绩不合格的30人中按性别利用按比例分配的分层抽样的方法随机抽取6人,再从这6人中随机抽取3人,记这3人中男生的人数为
![](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 | 0.01 | 0.005 | 0.001 | |
2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
未治愈 | 治愈 | 合计 | |
疗法![]() | 15 | 52 | 67 |
疗法![]() | 6 | 63 | 69 |
合计 | 21 | 115 | 136 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255cd2084765f7019367ff6e575b9d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)为提高临床医疗安全性,提高疾病的治愈率及好转率,同时降低医疗费用,降低患者医疗负担.该医院对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3911dc335840b8d4b729a5678fd680.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d781d2c53587db084f4893715b29e078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f558992e649b93ee36f37513781311a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f558992e649b93ee36f37513781311a8.png)
参考公式及数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![]() | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
![]() | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bbfc0c917fd1110836a41e056f03c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624ad60c2fb431f884462821a4f45c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9d132351928baad1f22eed999935f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
超市 | A | B | C | D | E | F | G |
广告费支出 | 1 | 2 | 4 | 6 | 11 | 13 | 19 |
销售额 | 19 | 32 | 40 | 44 | 52 | 53 | 54 |
(2)用二次函数回归模型拟合y与x的关系,可得回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74eee7e230e251beae944f007b436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
参考数据及公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d5b2592ea9f8b53c22aaf1113b9833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e56fc784110ba10f8d6eff4464bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955b0c57aa9ef5c18e62618894ad2919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361e2507c072169a9f5cda61ea1d3256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249411486a7ef89dd0375972674d3e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
超市 | |||||||
广告费支出 | |||||||
销售额 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)用二次函数回归模型拟合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74eee7e230e251beae944f007b436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f22cbe702303fae12a39a3e1db55ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3f457544f1a385e4b60885f0b28d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
未感染病毒 | 感染病毒 | 总计 | |
未注射疫苗 | 60 | ||
注射疫苗 | 30 | ||
总计 | 110 | 90 | 200 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
(1)能否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ca40b5a7476f844dad0e5f79fa69aa.png)
(2)在感染病毒的小白鼠中,按未注射疫苗和注射疫苗的比例抽取6只进行病理分析,然后从这6只小白鼠中随机抽取2只对注射疫苗的情况进行核实,求至少有1只为注射过疫苗的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357821e0e5595eaf3028df63d47b2c58.png)
(1)填写
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
男生 | 女生 | 合计 | |
2020年在直播平台购物 | |||
2020年未在直播平台购物 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![]() | 0.05 | 0.01 | 0.005 | 0.001 |
![]() | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)完成下列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
(2)若在犯错误的概率不超过0.05的前提下,可认为“性别与休闲方式有关”,那么本次被调查的人数至少有多少?
运动 | 非运动 | 总计 | |
男性 | |||
女性 | |||
总计 | ![]() |
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.050 | 0.010 | 0.001 |
![]() | 3.841 | 6.635 | 10.828 |