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根据以下资料,回答5~8题。 To us it seems so natural to put up an umbrella to keep the wate
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根据下表所给的资料,拟合一个回归模型,并回答下述问题。
(1)求出a、b,说明b的含意是什么?
(2)由题(1)所得的回归方程,标准估计误差是多少?
(3)对回归直线的斜率作显著性检验,P值是多少?
(4)一个13岁的男孩的血压估计值是多少?
血压与年龄的关系
年龄X 血压(mmHg)Y | 年龄X 血压(mmHg)Y |
5 94.4 6 97.7 7 101.9 8 104.5 9 106.3 | 12 113.8 13 117.7 14 121.6 15 122.3 16 123.6 |
根据以下内容回答题:
When I was a boy,children always objected(1)wearing school uniform. but teacherswere(2)on it because they said all of US looked(3).0therwise,they said,children would compete with(4)and the poorer children would be unhappy because people would see how poor they were.In recent years,however,many schools have(5)the idea of making children wear uniform. but funnily enough,now that children can wear(6)they like,they have adopted a uniform. of their own.When some journalists visited a London school,they found that aU the boys and girls were dressed in jcans.One girl said she would rather die than wear a coat instead of a jersey because(7)wants to look different(8)the other children in the class.Parents may not be as happy about th.is as children,but they(9)to be,because this new kind of uniform. is one that the children like,not something they have been forced to wear,and it is also(10)cheaper than school uniform. used to be.
请回答(1)题: 查看材料
A.against
B.to
C.for
D.on
A.7%
B.8%
C.15%
D.23%
A.13%
B.8%
C.3%
D.5%