年龄 | |||||
频数 | 30 | 75 | 105 | 60 | 30 |
持支持态度 | 24 | 66 | 90 | 42 | 18 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
年龄在50周岁以上(含50周岁) | 年龄在50周岁以下 | 总计 | |
持支持态度 | |||
不持支持态度 | |||
总计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
i | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
第 | 2 | 4 | 8 | 12 | 22 | 26 | 38 |
使用人数 | 19 | 32 | 40 | 44 | 52 | 53 | 54 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a097f133fc7d9fa5178e0438dabaa5.png)
0.050 | 0.010 | 0.001 | |
k | 3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad33923664ac6f63ea198e9b3ee8b3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
(1)若某个参加调查的同学能确定其中10个题目的答案,其余10个题目中,有5个题目他能够答对的概率均为0.6,另外5个题目他能够答对的概率均为0.2,求该同学答对题目个数的均值;
(2)将重庆和上海并为“南方组”,北京和天津并为“北方组”,通过调查得到如下列联表:
地域 | 了解程度 | 合计 | |
不了解 | 非常了解 | ||
南方组 | 53 | 112 | 165 |
北方组 | 96 | 139 | 235 |
合计 | 149 | 251 | 400 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072711e3fd17acb64c6a9b159969b18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f123998aab62d1c6719b34da5593c5c.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
参考数据:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dab2a95fba4b2f84516ddb7c47b388c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a01ec74335424d2c71bd66aed79ceee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9b643c1390575e30adbed000fbd28b.png)
②独立性检验常用小概率值和相应临界值:
a | 0.1 | 0.05 | 0.01 | 0.005 | 0.001 |
2.706 | 3.841 | 6.635 | 7.879 | 10.0828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
新举措实施前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
日均总销售额(万元) | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
天数 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
日均总销售额(万元) | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
天数 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/042e234d538bc2c789d7c5a314f1ca92.png)
日均总销售额小于![]() | 日均总销售额不小于![]() | 总计 | |
新举措实施前![]() | |||
新举措实施后![]() | |||
总计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(i)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b375231c69323a0e29c7eec150364dbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459bbba77b93d6755339365d20e279cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(ii)若甲、乙两团队在考核开始时都赋予
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
参考公式及数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f8ec200973736ac8bcd9aa633855d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
月份x | 7 | 8 | 9 | 10 | 11 |
销售量y | 10 | 12 | 11 | 12 | 20 |
接受 | 不接受 | 总计 | |
男 | 100 | ||
女 | 60 | ||
总计 | 110 |
感染 | 未感染 | 合计 | |
服用 | 10 | 40 | 50 |
未服用 | 20 | 30 | 50 |
合计 | 30 | 70 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8ba39098da71776d33fc1bbc9d8255.png)
0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0583307f7e3e249e02ed9932d310a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b7633c173cffa31d9faf390b4b8398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420041b1620337391ec00847937448df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cad116e629ef7912a71b7f31c9c74b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed19319ed811f46d8e1ee151d79ca75.png)
![](https://img.xkw.com/dksih/QBM/2022/9/2/3057813547794432/3060662600122368/STEM/32790f1730e2491498d245d1f5d2f805.png?resizew=190)
(1)求通过电视收看观众的平均年龄(同一组中的数据用该组区间的中点值为代表);
(2)把年龄在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebafc11983cfc28c1d92ff2c457f457.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2231c1ab41da94c5b3ebda2ded17c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
通过PC收看 | 通过电视收看 | |
青少年组 | ||
中老年组 |
0.100 | 0.050 | 0.025 | 0.010 | 0.005 | |
2.706 | 3.841 | 5.024 | 6.635 | 7.879 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e5cfd83f06d1a68c1f638c165089a5.png)
“二次游玩”愿望情况 年龄段 | 有“二次游玩”的愿望 | 无“二次游玩”的愿望 | 总计 |
青少年 | 8 | 2 | 10 |
中老年 | 2 | 6 | 8 |
总计 | 10 | 8 | 18 |
A.有95%的把握判断有“二次游玩”的愿望与年龄有关 |
B.有95%的把握判断有“二次游玩”的愿望与年龄无关 |
C.有99%的把握判断有“二次游玩”的愿望与年龄有关 |
D.有99%的把握判断有“二次游玩”的愿望与年龄无关 |
性别 | 参与意愿 | 合计 | |
愿意参与 | 不愿意参与 | ||
男性 | 48 | 60 | |
女性 | 18 | ||
合计 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
(2)为了更详细的了解情况,在100份有效问卷中抽取不愿意参与活动的人员若干人组成观摩小组,观摩小组恰有男性4名,女性3名.从观摩小组中选取3人为免费体验者,设免费体验者中男性人数为X,求X的分布列及数学期望.
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
下表给出了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953e89f7e797bf8fe9ff31e0d2f66728.png)
![]() | 0.1 | 0.05 | 0.01 | 0.005 | 0.001 |
![]() | 2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
(1)根据所给数据,完成下面2×2列联表,并依据小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
康复 | 末康复 | 单位: | |
甲组 | |||
乙组 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附表:
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f503f0dec4cf2cc95ad9521c5eaf9f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
注:双盲实验:是指在实验过程中,测验者与被测验者都不知道被测者所属的组别,(实验组或对照组),分析者在分析资料时,通常也不知道正在分析的资料属于哪一组.旨在消除可能出现在实验者和参与者意识当中的主观偏差和个人偏好.安慰剂:是指没有药物治疗作用,外形与真药相像的片、丸、针剂.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
A.150 | B.170 | C.240 | D.180 |