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.

完形填空
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.
(     )1. A. In    
(     )2. A. forty six
(     )3. A. A    
(     )4. A. England            
(     )5. A. other  
(     )6. A. America 
(     )7. A. twins  
(     )8. A. They   
(     )9. A. All    
(     )10. A. not   

B. At        
B. forty and six 
B. An          
B. English      
B. others       
B. american             
B. twin         
B. Their     
B. all         
B. Not                        

C. On         
C. fourteen six 
C. One         
C. Englishes     
C. the other               
C. Americas                
C. twines      
C. Them        
C. alls        
C. no        
D. About         
D. forty-six  
D. Ones          
D. Englandman     
D. the others      
D. American       
D. twinies      
D. theirs       
D. Alls          
D. No                           
实验题