Sample Size Calculator    
         
    Confidence Level
  Z Scores table  
        90% 1.645  
    Enter Margin of Error   pts. 95% 1.96  
        99% 5.576  
    Enter population         
    (leave blank if sample/population is less than 1% or unknown)        
         
    Proportion being tested      
    (50% default)        
    Sample size