1 . 下列四个命题:
①样本相关系数r越大,线性相关关系越强;
②回归直线就是散点图中经过样本数据点最多的那条直线;
③设
是不同的直线,
是不同的平面,若
∥
,且
,
则
∥
且
∥
;
④若直线
不垂直于平面
,则直线
不可能垂直于平面
内的无数条直线.
其中正确命题的序号为
①样本相关系数r越大,线性相关关系越强;
②回归直线就是散点图中经过样本数据点最多的那条直线;
③设
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/6f76625f7891461594cab492e98560d3.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/51187429bb184c8faebbe9375e8015aa.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/e918659909ff41f09f1964f3d1268fd2.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/50efb111160546b8afbbd771fb253724.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/a7ab2de4a38046aba3e0f3ba2df0f56a.png)
则
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/70a5522db47a416987ecec1f392be2de.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/1d65d55792f84675b7c1a1bb75b8caec.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/70a5522db47a416987ecec1f392be2de.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/8479772fca5149bf889a7cb9174b5546.png)
④若直线
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/50efb111160546b8afbbd771fb253724.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/1d65d55792f84675b7c1a1bb75b8caec.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/50efb111160546b8afbbd771fb253724.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572483885539328/1572483890921472/STEM/1d65d55792f84675b7c1a1bb75b8caec.png)
其中正确命题的序号为
A.①②③ | B.①③ | C.①②④ | D.③ |
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