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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:16:13                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              199/Rockwall                                              VRSN:      W
                                                        199-902/Royse City ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               89,300,817        0.9145            97,649,882              18              942         .008563914
      2           A               89,055,420        0.9870            90,228,389              46              631         .005422768
      3           A               89,080,413        1.0063            88,522,720              50              489         .004226418
      4           A               89,015,218        1.0596            84,008,322              50              340         .008320168
      5           C                8,563,502        0.9667             8,858,490               7              420         .023266906
      6           C                8,554,638        0.9240             9,258,266              11              288         .006498885
      7           C                8,575,891        0.9360             9,162,277              10              177         .005875847
      8           C                8,533,935        0.9990             8,542,477              11              112         .008792566
      9           D3              99,581,440        0.9605           103,676,668              26            2,357         .015465585
     10           F1               7,427,428        0.9783             7,592,178               6               67         .009904586
     11           F1               7,235,918        0.9774             7,403,231               8               25         .036707676
     12           F1               7,768,895        0.9875             7,867,235               6               14         .021362410
  RANDOM TOTALS:                 512,693,515                         522,770,135             249            5,862
  CATG J  EXCEPTION VALUES:       28,520,547                          29,324,915
  CATG D1 EXCEPTION VALUES:        3,661,250                           3,783,608
  CATG F1 EXCEPTION VALUES:        5,065,600                           6,699,114
 TOTAL TEST VALUES (4):          549,940,912                         562,577,772
 MARGIN OF ERROR PERCENT:          5.0000001
 MARGIN OF ERROR VALUE:           28,128,889
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            534,448,883 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             549,940,912 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            590,706,661 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             598,906,094 (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