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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:16:11                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              199/Rockwall                                              VRSN:      W
                                                        199-901/Rockwall ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              760,418,626        0.9595           792,515,504              50            5,341         .005887165
      2           A              759,254,612        0.9923           765,146,238              49            3,815         .005728168
      3           A              759,635,003        0.9921           765,683,906              49            2,786         .006726958
      4           A              759,635,911        0.9610           790,464,007              50            1,535         .011128553
      5           D3             209,323,890        0.9435           221,858,919              19            1,944         .012036596
      6           F1             110,038,695        0.9926           110,859,052               7              241         .002124509
      7           F1             112,046,573        0.9934           112,790,994               7               78         .006907985
      8           F1             111,434,049        0.9643           115,559,524               8               30         .037820976
  RANDOM TOTALS:               3,581,787,359                       3,674,878,144             239           15,770
  CATG D1 EXCEPTION VALUES:        3,016,850                           2,688,457
  CATG F1 EXCEPTION VALUES:       99,890,392                         104,847,470
 TOTAL TEST VALUES (4):        3,684,694,601                       3,782,414,071
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          189,120,704
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          3,593,293,367 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           3,684,694,601 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          3,971,534,775 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           4,111,339,806 (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