解题方法
1 . 红铃虫是棉花的主要害虫之一,某科研所研究人员对其繁殖情况进行了研究,发现其繁殖的数量y(单位:个)随时间x(单位:天)的变化情况如下表:
表一
令
,w与y的对应关系如下表
表二
(1)根据表一画出散点图,并判断用两种模型①
②
进行拟合,哪种模型更为合适?(给出判断即可,不需要说明理由);
![](https://img.xkw.com/dksih/QBM/2022/8/13/3043625528860672/3043752092426240/STEM/93602c5fbb3142419dc147a968e51c2b.png?resizew=212)
(2)根据(1)中所选择的模型,求出y关于x的回归方程(计算过程中四舍五入保留两位小数).
(3)要使其繁殖数量不超过4000个,预测繁殖天数不超过多少天.
参考公式:经验回归方程
,其中
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
参考数据:
,
,
,
,
,
,
表一
x | 1 | 2 | 3 | 4 | 5 | 6 |
y | 5 | 10 | 25 | 50 | 100 | 200 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e735d4c5f75673620ec90952bd065dd.png)
表二
y | 5 | 10 | 25 | 50 | 100 | 200 |
w | 1.61 | 2.30 | 3.22 | 3.91 | 4.61 | 5.30 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0060fcce4ccb55ffddbf2369065d19a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.png)
![](https://img.xkw.com/dksih/QBM/2022/8/13/3043625528860672/3043752092426240/STEM/93602c5fbb3142419dc147a968e51c2b.png?resizew=212)
(2)根据(1)中所选择的模型,求出y关于x的回归方程(计算过程中四舍五入保留两位小数).
(3)要使其繁殖数量不超过4000个,预测繁殖天数不超过多少天.
参考公式:经验回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dbdbf02e0dd324daba7488c3e3bf31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6407d6e3ae37c75712e4fc1b5f0313c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ca9ac57c530517df066593dfa2fdff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66224b2ee66c6818f6fe085d3ab2eff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea43a77589121a4ef66049431da13929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9721500d4528b8f2d8b0e9077b0cf2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9152492a164b3902c6d5a21faba0ca20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4943ed8e916ef62644d770b5977a50f.png)
您最近一年使用:0次