data propx;
input clss count  @@;
cards;
1 90  2 10
;
proc freq order=data; weight count;
  tables clss / binomial;
run;
----------------------------------------------------

  The SAS System           09:49 Friday, May 4, 2001   1

                    The FREQ Procedure

                                 Cumulative    Cumulative
clss    Frequency     Percent     Frequency      Percent
---------------------------------------------------------
   1          90       90.00            90        90.00
   2          10       10.00           100       100.00


             Binomial Proportion for clss = 1
             --------------------------------
             Proportion                0.9000
             ASE                       0.0300
             95% Lower Conf Limit      0.8412
             95% Upper Conf Limit      0.9588

             Exact Conf Limits
             95% Lower Conf Limit      0.8238
             95% Upper Conf Limit      0.9510

               Test of H0: Proportion = 0.5

             ASE under H0              0.0500
             Z                         8.0000
             One-sided Pr >  Z         <.0001
             Two-sided Pr > |Z|        <.0001

                    Sample Size = 100