The SAS System 

                      The POWER Procedure
                 Z Test for Binomial Proportion

                    Fixed Scenario Elements

              Method                         Exact
              Number of Sides                    2
              Null Proportion                  0.5
              Binomial Proportion              0.6
              Total Sample Size                100
              Variance Estimate      Null Variance
              Nominal Alpha                   0.05
                         Computed Power
               Lower    Upper
                Crit     Crit     Actual
                 Val      Val      Alpha    Power

                  40       60     0.0569    0.543

                    Fixed Scenario Elements

          Method                 Normal approximation
          Number of Sides                           2
          Null Proportion                         0.5
          Binomial Proportion                     0.6
          Variance Estimate             Null Variance
          Alpha                                  0.05


                         Computed Power
 
                                   N
                      Index    Total    Power

                          1      100    0.516
                          2       50    0.289

                      The POWER Procedure
                 Z Test for Binomial Proportion

                    Fixed Scenario Elements

          Method                 Normal approximation
          Number of Sides                           1
          Null Proportion                         0.5
          Alpha                                 0.025
          Binomial Proportion                     0.6
          Variance Estimate             Null Variance


                         Computed Power
 
                                   N
                      Index    Total    Power

                          1      100    0.516
                          2       50    0.289

                      The POWER Procedure
                 Z Test for Binomial Proportion
                    Fixed Scenario Elements
          Method                 Normal approximation
          Number of Sides                           2
          Null Proportion                         0.5
          Binomial Proportion                     0.6
          Nominal Power                           0.8
          Variance Estimate             Null Variance
          Alpha                                  0.05

                        Computed N Total
                        Actual        N
                         Power    Total
                         0.800      194