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问题 单项选择题

按最小二乘法估计回归方程=a+bx中参数的实质是使（）。

A.A

B.B

C.C

C.C

答案

参考答案：C

解析：

最小二乘法估计回归方程中参数的实质是每一个指标实测值与指标理论值的离差平方和最小，即Q(β0，β1)=∑(y-)2=∑[yi-(β0+β1xi]2最小。

完形填空
完形填空。
     Many years ago, a man    1       Wu taught King Wang how to ride horses and how to drive  a chariot (马拉战车). 2       some time the king started to race against Wu. But no matter how many 3      the king
raced against Wu, Wu always won.
     The king was     4      and said to Wu,  “You have taught me how to ride and how to drive a chariot.
But  I don’t think you have taught me everything about    5    . ” “I have taught you       6   I know” 
   7     Wu. “But you have not learned everything.  The     8     thing about driving a chariot is to think of
the horses.  The driver of the chariot and the horses should work together. You can then go very   9    and drive for long distances. But your problem is this:   When you are behind me, you want to      10   with me. And when you are   11     me, you are afraid that I will catch up with you.    12     whether you are in front of me or behind me, you are thinking of me. You are not thinking of your   13     .If you want to  win,  you
must 14   thinking of me. You   15   think only of your horses. ”
( ) 1. A. calls      
( ) 2. A. In        
( ) 3. A. times      
( ) 4. A. happy      
( ) 5. A. playing    
( ) 6. A. everything
( ) 7. A. asked      
( ) 8. A. dangerous  
( ) 9. A. slowly    
( ) 10.A. catch up  
( ) 11.A. beside    
( ) 12.A. So        
( ) 13.A. cows      
( ) 14.A. start      
( ) 15.A. mustn't   		B. names        
B. After        
B. days        
B. glad        
B. racing      
B. something    
B. told        
B. newer        
B. soon        
B. do          
B. in front of  
B. But          
B. dogs        
B. stop        
  B. may         		C. called      
C. Since      
C. weeks      
C. pleased    
C. running    
C. anything    
C. answered    
C. beautiful  
C. fast        
C. talk        
C. near        
C. Or          
C. pigs        
C. keep        
C. must       		  D. name          
  D. Before        
  D. months        
  D. unhappy        
  D. working        
  D. nothing        
  D. spoke          
  D. most important
  D. slow          
  D. help          
  D. next to        
  D. And            
  D. horses        
  D. begin          
   D. can          
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