样本均数的抽样分布有哪些特点?

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问题:

样本均数的抽样分布有哪些特点?

考点:统计学统计学综合练习统计学综合练习题库
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       for the breakdown of the school computer network,Alice was in low spirits. [ ]

A.Blaming

B.Blamed

C.To blame

D.To be blamed

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如图为海陆分布状况图,按时间的先后,排列顺序正确的是(  )

A.c、d、a、b

B.a、b、c、d

C.d、c、b、a

D.b、d、a、c

题型:问答题 简答题

长时间来,支付宝都是线上支付最主要的方式,但由于其在线支付,和其他网络应用一样,是存在木马等恶意插件及病毒的______威胁的。而近年来新出现的移动手机支付,由于其自身______的安全优势及便捷程度,越来越受宠。支付宝与移动手机支付在接下来的发展中,正面交锋已______。
依次填入划横线部分最恰当的一项是( )。

A.潜在 先天 不可避免

B.严重拥有 迫在眉睫

C.绝对 衍生 在所难免

D.多重 鲜明 势不可挡

题型:问答题 简答题
完形填空
     When your kids were six or seven, you sent them to school. Did you ever wonder what goes through
a teacher's   1    as he or she tries to teach your kids? Did you ever wonder what the teacher   2   from
you,  the parents?
      Parents can be   3  or suspicious. They can be of great help to the teacher    4    be in need of help
themselves. Some teachers think parents are too   5    on their children. Here is   6   one teacher puts it.
     "I usually have the   7    of parents coming in and     8   me how much they care about the kids'
education and how they really   9   their kids. They tell me they stand and    10   them closely when they
do their homework. Sometimes the    11   offer help with the kids' lessons as if they were teachers. They
check their school work, and are too sensitive to  12  . They blame the kids on everything having to do 
  13   school. When a parent asks me how his or her kid is getting on in my class, my answer usually is'
Well, you know,  he is   14   a good kid. He is fine in my class. Maybe you don't have to be so   15   
with your kid.'"
      Teachers want parents  to  know that  they are professionals  at    16    with  children.  They  have
   17    many children and even parents. Because of this, teachers can be   18    at educating children.
Teachers are   19    that parents want their children to do well, but they know more about what children
should be able to do at different ages and   20  .
( )1. A. heart    
( )2. A. reflects  
( )3. A. effective  
( )4. A. but       
( )5. A. hard      
( )6. A. where    
( )7. A. problems    
( )8. A. advising  
( )9. A. help with  
( )10. A. connect  
( )11. A. even    
( )12. A. marks  
( )13. A. at       
( )14. A. nearly  
( )15. A. satisfied  
( )16. A. working    
( )17. A. fed      
( )18. A. pleased  
( )19. A. content  
( )20. A. stages  
B. mind        
B. results      
B. attentive    
B. or            
B. keen          
B. how          
B. contracts    
B. examining    
B. deal with    
B. guide        
B. already      
B. efforts      
B. beyond        
B. really        
B. careful      
B. playing      
B. observed      
B. worried      
B. doubtful      
B. classes      
C. soul    
C. benefits  
C. supportive  
C. thus      
C. dependent  
C. when      
C. accidents  
C. telling  
C. make up  
C. watch      
C. still      
C. pains      
C. in        
C. seldom     
C. strict    
C. staying    
C. attended  
C. disappointed
C. aware      
C. schools    
D. spirit            
D. expects          
D. positive          
D. as                
D. crazy            
D. why              
D. agreements        
D. instructing      
D. give up          
D. inspire          
D. merely            
D. words            
D. with              
D. hardly            
D. cautious          
D. joking            
D. greeted          
D. experienced      
D. suspicious        
D. projects          
题型:问答题 简答题

在下列计算机应用项目中,属于数值计算应用领域的是()

A.气象预报

B.文字编辑系统

C.运输行李调度

D.专家系统

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