问题
选择题
已知回归直线的斜率为2.03,样本中心(5,11),则回归直线方程为( )
A.y=2.03x-0.85
B.y=2.03x+0.85
C.y=2.03x+0.55
D.y=2.03x-0.55
答案
回归直线斜率的值为2.03,样本点的中心为(5,11),
则回归直线方程为y-11=2.03(x-5),即y=2.03x+0.85
故选B.
已知回归直线的斜率为2.03,样本中心(5,11),则回归直线方程为( )
A.y=2.03x-0.85
B.y=2.03x+0.85
C.y=2.03x+0.55
D.y=2.03x-0.55
回归直线斜率的值为2.03,样本点的中心为(5,11),
则回归直线方程为y-11=2.03(x-5),即y=2.03x+0.85
故选B.
完形填空。 | ||||
1 Miss Gao's class there are 2 students. There are twenty-four boys, and twenty-two girls. 3 of the boys is 4 . His name is Jim. All 5 boys are Chinese . All of the Chinese students are Young Pioneers. In the class there are two 6 girls. They are 7 . 8 names are Lily and Lucy. The other girls are Chinese. We are 9 friends. There's 10 difference, American-English-Chinese. | ||||
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