名校
解题方法
1 . 当前,全球贸易格局发生重大变化,随着中美贸易战的不断升级,让越来越多的中国科技企业开始意识到自主创新的重要性,大大加强科技研发投入的力度,形成掌控高新尖端核心技术及其市场的能力.某企业为确定下一年对某产品进行科技升级的研发费用,需了解该产品年研发费用
(单位:千万元)对年销售量
(单位:千万件)和年利润
(单位:千万元)的影响.根据市场调研与模拟,对收集的数据
进行初步处理,得到散点图及一些统计量的值如下:
![](https://img.xkw.com/dksih/QBM/2020/7/13/2505210547322880/2505975987912704/STEM/8cd110f3-6bc8-4edf-8c92-c9d995a27faa.png?resizew=475)
表中
,
.
(1)根据散点图判断,
与
哪一个更适合作为年销售量
关于年研发费用
的回归方程类型(给出判断即可,不必说明理由),并根据判断结果及表中数据,建立
关于
的回归方程;
附:对于一组数据
,其回归直线
的斜率和截距的最小二乘估计分别为
,
.
(2)已知年利润
与
,
的关系为
(其中
为自然对数的底数),要使企业下一年的年利润最大,预计下一年应投入多少研发费用?
(3)科技升级后,该产品的效率
大幅提高,经试验统计得
大致服从正态分布
.企业对科技升级团队的奖励方案如下:若
不超过
,不予奖励;若
超过
,但不超过
,每件产品奖励2元;若
超过
,每件产品奖励4元.记
为每件产品获得的奖励,求
(精确到0.01).
附:若随机变量
,则
,
.
![](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/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29d8b5cbd162d45102f096b8c72dbaf.png)
![](https://img.xkw.com/dksih/QBM/2020/7/13/2505210547322880/2505975987912704/STEM/8cd110f3-6bc8-4edf-8c92-c9d995a27faa.png?resizew=475)
30.5 | 15 | 15 | 46.5 |
表中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90229c4f76db5de308cf8d5fc382099b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c26fa1e573812fab6a173a4eb0ed38.png)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b208f6e759bebeb26519053ba2ef83.png)
![](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)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca0dbbde8a91d17e1a7effb91483a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93fce3b86129d96836d72f3f01c7abf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1668317622622012f4f8902c48fd05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ff0671492cc8f5ae8faea92afb4c2d.png)
(2)已知年利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.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/4f66d3a55ac5924f52fefff6c450b267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(3)科技升级后,该产品的效率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd8ae0cba7941c9e17b37b0488a2d9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc00118b6316f277160328cf6a27a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc00118b6316f277160328cf6a27a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f3b14077a836364b784211836fa786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f3b14077a836364b784211836fa786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71701db4b413f2364dbcbd612fbc8a67.png)
附:若随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c754b0b36dc53a8ecb31208e7095aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97705bedd45b860523d4fac71b64100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c4b275f466e0ef3d15d61e471e34d.png)
您最近一年使用:0次
2020-07-14更新
|
408次组卷
|
2卷引用:湖南省衡阳市第八中学2020届高三下学期高考适应性考试理科数学试题
名校
2 . 某公司为提高市场销售业绩,设计了一套产品促销方案,并在某地区部分营销网点进行试点.运作一年后,对“采取促销”和“没有采取促销”的营销网点各选了50个,对比上一年度的销售情况,分别统计了它们的年销售总额,并按年销售总额增长的百分点分成5组:
,
,
,
,
,分别统计后制成如图所示的频率分布直方图,并规定年销售总额增长10个百分点及以上的营销网点为“精英店”.
“采用促销”的销售网点:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/ee70e3f8-db9d-43a2-ae87-660dbb15a05c.png?resizew=240)
“不采用促销”的销售网点:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/562f4815-840a-45be-bc04-99d9a60b121c.png?resizew=242)
(1)请根据题中信息填充下面的列联表,并判断是否有
的把握认为“精英店与采用促销活动有关”;
(2)某“精英店”为了创造更大的利润,通过分析上一年度的售价
(单位:元)和日销量
(单位:件)(
)的一组数据后决定选择
作为回归模型进行拟合.具体数据如下表,表中的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcd912c7b158f4b01d461af4ab667f7.png)
①根据上表数据计算
,
的值;
②已知该公司产品的成本为10元/件,促销费用平均5元/件,根据所求出的回归模型,分析售价
定为多少时日利润
可以达到最大.
附①:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
附②:对应一组数据
,
其回归直线
的斜率和截距的最小二乘法估计分别为
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fed1a2253e5d338c559e9acb6178ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2eacc56e3d553c342a3043ef17d38cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab576120a9cf7c1a84c2a45e542b838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf19bf1d7029e467485a4420567b1b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faa4361d85e43e333d76dc2a4c81f03.png)
“采用促销”的销售网点:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/ee70e3f8-db9d-43a2-ae87-660dbb15a05c.png?resizew=240)
“不采用促销”的销售网点:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/562f4815-840a-45be-bc04-99d9a60b121c.png?resizew=242)
(1)请根据题中信息填充下面的列联表,并判断是否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe157a9c3fe004a25bf1fb79c8c0a1b.png)
采用促销 | 无促销 | 合计 | |
精英店 | |||
非精英店 | |||
合计 | 50 | 50 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4811306061eac1439de082c9b4a8ba78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f9a2cac63ef9765398246ebe598b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcd912c7b158f4b01d461af4ab667f7.png)
45.8 | 395.5 | 2413.5 | 4.6 | 21.6 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
②已知该公司产品的成本为10元/件,促销费用平均5元/件,根据所求出的回归模型,分析售价
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
附①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
0.100 | 0.050 | 0.010 | 0.001 | |
2.706 | 3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbdb41504e73c03d6542692b20306cb.png)
其回归直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0943f70585435955d528325e51ef013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b437479a91eacb9a49436c0cbf67c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815e2869dc16e2ae7a7e1911e3afc8c3.png)
您最近一年使用:0次
2020-01-17更新
|
907次组卷
|
3卷引用:湖南省邵阳市2019-2020学年高三第一次联考数学(文)试题
湖南省邵阳市2019-2020学年高三第一次联考数学(文)试题(已下线)专题03 独立性检验(第四篇)-备战2020年高考数学大题精做之解答题题型全覆盖重庆市第七中学2022届高三上学期第二次月考数学试题