解题方法
1 . 某企业拟对手机芯片进行科技升级,根据市场调研,得到科技升级投入
(亿元)与科技升级直接收益
(亿元)的数据统计如下:
根据表格中的数据,当
时,建立了
与
的两个回归模型:模型①:
;模型②:
;当
时,确定
与
满足的线性回归方程为
.
(1)根据下列表格中的数据,比较当
时,模型①、②的相关指数的大小,并选择拟合精度更高、更可靠的模型;
(附:刻画回归效果的相关指数
)
(2)为鼓励科技创新,当科技升级的投入不少于
亿元时,国家给予公司补贴
亿元,比较根据市场调研科技升级投入
亿元直接收益与投入
亿元时科技升级实际收益的预测值的大小;
(附:用最小二乘法求线性回归方程
的系数:
)
(3)科技升级后,芯片的效率
大幅提高,经实际试验得
大致服从正态分布
.公司对科技升级团队的奖励方案如下:若芯片的效率不超过
,不予奖励;若芯片的效率超过
,但不超过
,每部芯片奖励
元;若芯片的效率超过
,每部芯片奖励
元,记
为每部芯片获得的奖励额,求
(精确到
).
(附:若随机变量
,
,
.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
序号 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
2 | 3 | 4 | 6 | 9 | 11 | 13 | 15 | 17 | 19 | |
13 | 22 | 31 | 42 | 50 | 56 | 58 | 62 | 63 | 65 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4423aa36a9e5fb5baf18ebdad8c80810.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/4b0984caa396de1a2ef816180740ec95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1669102bc076b1f98d93299c266e698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0365c8d11255eabb01a9ecd04f25df18.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/991b860a6e876fb1cd423d408281ae61.png)
(1)根据下列表格中的数据,比较当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4423aa36a9e5fb5baf18ebdad8c80810.png)
回归模型 | 模型① | 模型② |
回归方程 | ||
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c8cd473a8b5a8da1f04b5041e609b0.png)
(2)为鼓励科技创新,当科技升级的投入不少于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5453184e251cfe787b5965cd38426962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
(附:用最小二乘法求线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdfc6ddcaa756c907cb792b2d758988f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea338af6871374f003fc673b258a4150.png)
(3)科技升级后,芯片的效率
![](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/dbdc30fc50dfd2f05b78d0ee9e761e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1065ae0947705c7d16a5a86c78f07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1065ae0947705c7d16a5a86c78f07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1bf6397ca5836b6b643ddc0de5383d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1bf6397ca5836b6b643ddc0de5383d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71701db4b413f2364dbcbd612fbc8a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2c4d12b3a705daab723ab243b6cc88.png)
(附:若随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c443876bfaf9f252fb2a1e91c3271508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97705bedd45b860523d4fac71b64100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c4b275f466e0ef3d15d61e471e34d.png)
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