1 .
种棉花以绒长、品质好、产量高著称于世.我国2020至2021年度
种棉花产量为
万吨,占国内产量比重约
,占国内消费比重约
.已知某地区所产
种棉花的产量
与光照时长
之间的关系如表.若根据表中的数据用最小二乘法求得
关于
的回归直线方程为
,则下列说法中正确的有_______ .(把正确答案的编号全部填上)
①该回归直线过点
;②
种棉花的产量与光照时长成正相关;
③
的值是
;④当光照时长为
小时时,
种棉花的产量一定为
万吨.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3e1e7b762d1406165b31a926f33068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47813964896d5391cc797b18d02ad2bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8331e32f550068fc498e73125e32140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e88f33cca6b86802ad3d6f2f68480d3.png)
光照时长![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
产量![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe49022cdf47f3f162c7a706d0b0add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76fba0fe83cf0aa9a68210591cac1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5addb4c35fcfb719f6da39fff93c2497.png)
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