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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:24:58                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              246/Williamson                                            VRSN:      W
                                                        246-909/Round Rock ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A            2,100,657,342        0.9726         2,159,836,872             100           16,576         .002573577
      2           A            2,100,687,540        0.9849         2,132,894,243              99           12,767         .004008434
      3           A            2,100,591,444        0.9862         2,129,985,240             100            9,539         .004383097
      4           A            2,100,378,864        0.9837         2,135,182,336              99            6,323         .002582031
      5           B              355,811,336        0.9776           363,964,133              57            1,207         .005909203
      6           B              355,633,995        0.9916           358,646,627               8               35         .005704970
      7           B              377,013,073        0.9638           391,173,556               6               18         .004131734
      8           B              331,619,009        1.0054           329,837,884               7               10         .003159580
      9           C              107,840,615        0.9758           110,515,080              27            1,736         .012044209
     10           C              108,364,621        1.0239           105,835,161               8              194         .009494518
     11           C              109,916,780        1.0122           108,591,958               8               68         .000650159
     12           C              104,465,450        0.9778           106,837,237               6               17         .000485271
     13           D3              74,404,087        0.9731            76,460,885              14              580         .004871478
     14           F1             595,762,231        0.9691           614,758,261              14              651         .009259070
     15           F1             595,325,530        0.8878           670,562,661               8              174         .023764959
     16           F1           1,187,050,941        0.9110         1,303,019,694              13               73         .073263679
     17           L1             231,190,223        0.9989           231,444,812               7            1,322         .002965900
     18           L1             233,035,878        0.9354           249,129,654               7              197         .025310217
     19           L1             459,254,660        0.9649           475,960,887               8               61         .000840200
  RANDOM TOTALS:              13,629,003,619                      14,054,637,181             596           51,548
  CATG D1 EXCEPTION VALUES:        1,898,775                           1,898,817
 TOTAL TEST VALUES (4):       13,630,902,394                      14,056,535,998
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          702,826,800
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:         13,353,709,198 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:          13,630,902,394 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:         14,759,362,798 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):          14,572,982,698 (SEE ISD SUMMARY WORKSHEET)

 SOURCES:
 (1) SEE STRATIFIED CATEGORY WORKSHEET REPORTS PTS236, PTS430
 (2) NUMBER OF PARCELS SAMPLED BY STAFF
 (3) TOTAL CATEGORY PARCELS FROM STRATIFICATION REPORT APPRAISAL ROLL, OR SELF-REPORT
 (4) INCLUDES ANY PARCELS IN A, B, C, D3, F1, G1, G2,OR L1 MARKED AS EXCEPTION PROPERTIES
 (5) UNSTUDIED CATEGORIES AND SUB-CATEGORIES WERE NOT INCLUDED IN THE CONFIDENCE INTERVAL VALUES