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            S ubject:   S tatistics  
                                     
Created   b y:   J ianru   S hi  
                                   
 
Revised:   3 /2/2017  
Using   t he   S tandard   N ormal   T able  
 
There   a re   t wo   t ypes   o f   s tandard   n ormal   t ables.   B efore   a ttempting   t o   f ind   e ither   t he   z -­‐score   o r   t he  
probability   o n   t he   t able,   m ake   s ure  
you   k now   w hich   t able   y ou   a re   u sing.      
The   C umulative   P robability   T able  
Each   e ntry   i n   t he   c umulative  
probability   t able   i s   t he   p robability  
of   a   r andom   v ariable   ( x)   i s   l ess   t han   o r   e qual   t o   a   s pecified   v alue   ( z),   w hich   i s   i llustrated   i n   t he  
graph   a s   t he   s haded   a rea   f rom   t he   v alue   z   t o   t he   l eft.  
 
The   N ormal   C urve   A rea   T able    
 
Each   e ntry   i n   t he   n ormal   c urve   a rea   t able   i s   t he   p robability   o f   a   r andom   v ariable   ( x)   i s   b etween   0  
and   t he   s pecial   v alue   z ,   w hich   i s   i llustrated   i n   t he   g raph   a s   t he   s haded   a rea   f rom   t he   0   t o   v alue   z .    
 
 
 
 
                                                                                                                                                                                                                     
 

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