项目 | 常喝 | 不常喝 | 总计 |
肥胖 | 2 | ||
不肥胖 | 18 | ||
总计 | 30 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3a08e770d5b030c3219c3ee4a695f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![]() | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
(2)是否有97.5%的把握认为青少年肥胖与常喝碳酸饮料有关?
相似题推荐
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(Ⅰ)根据以上数据完成下列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://img.xkw.com/dksih/QBM/2017/8/17/1754071406075904/1754141751271424/STEM/1ab1c642294140fa8c5b1bb9ce10e5fd.png?resizew=317)
(Ⅱ)能否在犯错误的概率不超过0.01的前提下,认为选择影片类型与性别有关?
附:
… | 0.10 | 0.05 | 0.025 | 0.010 | 0.001 | |
… | 2.706 | 3.841 | 5.024 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1249c4345b5793f63df54e8825fc05.png)
(1)求等高条形图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)根据所给数据,完成下面的列联表:
抗体情况 | 灭活疫苗 | 核酸疫苗 | 总计 |
抗体为阳性 | |||
抗体为阴性 | |||
总计 | 100 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/d1d8f789-afa6-4d11-bc19-eb071795e4d0.png?resizew=277)
(3)判断能否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
每天锻炼的时长(分钟) | ||||||
人数 | 7 | 12 | 34 | 27 | 80 | 40 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34b954d94397d84edcc74d3d4361c48.png)
(1)请根据上述表格的统计数据,填写下面列联表,并根据列联表判断是否有95%的把握认为“运动达人”与性别有关:
运动达人 | 非运动达人 | 合计 | |
男生 | 100 | ||
女生 | 55 | ||
合计 | 200 |
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
参考数据:
0.05 | 0.025 | 0.010 | |
3.841 | 5.024 | 6.635 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/b2c0dd47-e0cd-422f-bc25-f7d6ee3edbed.png?resizew=302)
将得分不低于70分的学生视作了解,已知有50名男生问卷调查得分不低于70分.
(1)根据已知条件完成下面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648bc82198290fc181c814fb15578add.png)
男 | 女 | 合计 | |
了解 | |||
不了解 | |||
合计 |
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b69d0feb6bbd9faf42b55275678840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8149d1b35cd5106e39b4a14e9b75339.png)
参考数据:
0.10 | 0.05 | 0.010 | 0.005 | |
2.706 | 3.841 | 6.635 | 7.879 |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/e9c81727-9647-4ed0-baca-8af7d0a7f1ff.png?resizew=303)
(Ⅰ)分析甲、乙两班的样本成绩,大致判断哪种教学方式的教学效果更佳,并说明理由;
(Ⅱ)由以上统计数据完成下面的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
甲班 | 乙班 | 总计 | |
成绩优良 | |||
成绩不优良 | |||
总计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f74251e57c0ab3e892e9b7dd5e4c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
独立性检验临界值表:
P(K2≥k0) | 0.10 | 0.05 | 0.025 | 0.010 |
k0 | 2.706 | 3.841 | 5.024 | 6.635 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/d13ca46f-2e64-49fd-8bc0-947899abc8b0.png?resizew=80)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若从上述成绩在90分以下的学生中随机抽取3名,求恰有1人成绩为82分的概率;
(3)为了研究高三男、女生的体能情况,现对该校高三所有学生的体能测试成绩进行分类统计,得到的数据如下表所示:
男生 | 女生 | |
体能测试成绩超过80分 | 300 | 250 |
体能测试成绩不超过80分 | 100 | 150 |
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
临界值表:
0.100 | 0.050 | 0.010 | 0.001 | |
2.706 | 3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
单位:人
性别 | 踢足球 | 合计 | |
喜爱 | 不喜爱 | ||
男 | 4 | ||
女 | 9 | ||
合计 | 50 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
(1)求表中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
(2)依据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7110dbe1171707a78b3b5c9fcb2498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3a08e770d5b030c3219c3ee4a695f4.png)
常喝 | 不常喝 | 合计 | |
有糖尿病 | 2 | ||
无糖尿病 | 18 | ||
合计 | 30 |
(2)是否有99.5%的把握认为糖尿病与喝酒有关?请说明理由.
(3)已知常喝酒且有糖尿病的人中恰有两名老年人,其余为中年人,现从常喝酒且有糖尿病的人中随机抽取2人,求恰好抽到一名老年人和一名中年人的概率.
参考公式及数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
持反对意见 | 赟同 | 总计 | |
男 | ![]() | ||
女 | ![]() | ||
总计 | ![]() | ![]() |
②请根据表中数据判断,能否有的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ca40b5a7476f844dad0e5f79fa69aa.png)
(2)若表中持反对意见的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
附参考公式及数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450771658326016/2452885264809984/STEM/f8e3f0973dd74f3fa8c1ca9aa899136e.png?resizew=264)
(1)求频率分布直方图中实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)估计20名学生成绩的平均数;
(3)从成绩在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07ec8f9cbba3db3bf923e10dbe39d736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d391ee9a74a0383f572f416a65336530.png)
期中考试的数学成绩频数分布表
数学成绩 | |||||
频数 | 4 | 14 | 16 | 4 | 2 |
数学成绩 | |||||
频数 | 6 | 10 | 12 | 8 | 4 |
(2)估计这40名学生期末考试的数学成绩的平均分比期中考试数学成绩的平均分提高多少分.(同一组中的数据用该组区间的中点值作代表)
(1)根据以上信息,完成下面的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b253ec362b46012c30d1eb2d3030ee2a.png)
长时间使用手机娱乐 | 非长时间使用手机娱乐 | 合计 | |
成绩下降 | |||
成绩未下降 | |||
合计 | 90 | 200 |
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |