| 释义 | 
		Difference of SuccessesIf   and   are the observed proportions from standard Normally Distributedsamples with proportion of success  , then the probability that
    | (1) |  
  will be as great as observed is
   | (2) |  
  where
  Here,   is the Unbiased Estimator.  The Skewness and Kurtosis of this distribution are
 
 
  |