对于两个变量
和
进行回归分析,得到一组样本数据:
,
,…,
,下列说法中错误的是
![](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/56720e2f2b0ddd72156da495923698da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2852ae85cfcc804b3192ea8543c88938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92abae836b8026511113ad8c3ea23028.png)
A.由样本数据得到的回归方程![]() ![]() |
B.残差的平方和越小的模型,拟合的效果越好 |
C.用![]() ![]() |
D.若样本点呈条状分布,则变量![]() ![]() |
11-12高二上·吉林·期末 查看更多[1]
(已下线)2011年吉林省实验中学高二上学期期末质量检测数学文卷
更新时间:2016-11-30 14:02:53
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【推荐1】在某个物理实验中,测得变量
和变量
的几组数据如表:
则下列对
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则下列对
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】为了对变量
,
的线性相关性进行检验,由样本点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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A.若所有样本点都在直线![]() ![]() |
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C.若所有样本点都在直线![]() ![]() |
D.若![]() ![]() ![]() |
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【推荐1】下列说法:
①将一组数据中的每个数据都加上或减去同一个常数后,方差恒不变;
②设有一个回归方程
,变量x增加一个单位时,y平均增加5个单位;
③线性回归方程
必过
;
④在一个
列联表中,由计算得是
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其中错误的个数是
本题可以参考独立性检验临界值表:
①将一组数据中的每个数据都加上或减去同一个常数后,方差恒不变;
②设有一个回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a895f412e2de1fef81c88e1a5783ad7.png)
③线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a28bb16c363a6b186faaa49577572f.png)
④在一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ca40b5a7476f844dad0e5f79fa69aa.png)
其中错误的个数是
本题可以参考独立性检验临界值表:
0.05 | 0.40 | 0.25 | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
0.455 | 0.708 | 1.323 | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
A.0 | B.1 | C.2 | D.3 |
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【推荐2】已知
,
的线性回归直线方程为
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x | 0 | 1 | 2 | 3 |
y | 0.8 | m | 3.1 | 4.3 |
A.变量![]() ![]() | B.可以预测,当![]() ![]() |
C.![]() | D.由表格数据可知,该回归直线必过点![]() |
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【推荐2】某同学用收集到的6组数据对
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①
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A.①② | B.①②③ | C.②④ | D.②③④ |
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