

DIFFER - Difference Between Rates, Proportions, or Means
Tuesday, 4th December 2001.
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DATA
Rate #1 per 100 = 6
Rate #2 per 100 = 18

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 Comparison of rates per 100:  6, 18                                        
                                                                            
 Difference = 12 per 100                                                    
                                                                            
 Standard error of difference = 9.5714                                      
                                                                            
 Z = 0.78         P = 0.434                                                 
                                                                            
 90% confidence interval of difference = -8.1917 to 32.1917 per 100         
 95% confidence interval of difference = -11.2067 to 35.2067 per 100        
 99% confidence interval of difference = -17.1027 to 41.1027 per 100        
                                                                            
                                                                            

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DATA
Rate #1 per 10 = 7
Rate #2 per 10 = 6

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 Comparison of rates per 10:  7, 6                                          
                                                                            
 Difference = 1 per 10                                                      
                                                                            
 Standard error of difference = 1.2297                                      
                                                                            
 Z = 0.55         P = 0.581                                                 
                                                                            
 90% confidence interval of difference = -1.3532 to 3.3532 per 10           
 95% confidence interval of difference = -1.7405 to 3.7405 per 10           
 99% confidence interval of difference = -2.4980 to 4.4980 per 10           
                                                                            
                                                                            

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