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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:34:33                                       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               89,274,233        0.9145            97,620,812              18              942         .008563914
      2           A               89,028,909        0.9870            90,201,529              46              631         .005422768
      3           A               89,053,894        1.0063            88,496,367              50              489         .004226418
      4           A               88,988,719        1.0596            83,983,314              50              340         .008320168
      5           C                8,515,883        0.9667             8,809,230               7              420         .023266906
      6           C                8,507,069        0.9240             9,206,785              11              288         .006498885
      7           C                8,528,204        0.9360             9,111,329              10              177         .005875847
      8           C                8,486,481        0.9990             8,494,976              11              112         .008792566
      9           D3             100,916,030        0.9605           105,066,143              26            2,224         .015465585
     10           F1               7,543,953        0.9783             7,711,288               6               67         .009904586
     11           F1               7,349,439        0.9774             7,519,377               8               25         .036707676
     12           F1               7,890,777        0.9875             7,990,660               6               14         .021362410
  RANDOM TOTALS:                 514,083,591                         524,211,810             249            5,729
  CATG J  EXCEPTION VALUES:       28,520,547                          30,699,679
  CATG D1 EXCEPTION VALUES:        3,648,070                           3,775,791
  CATG F1 EXCEPTION VALUES:        5,065,600                           6,699,114
 TOTAL TEST VALUES (4):          551,317,808                         565,386,394
 MARGIN OF ERROR PERCENT:          5.0000001
 MARGIN OF ERROR VALUE:           28,269,320
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            537,117,074 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             551,317,808 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            593,655,714 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             600,409,630 (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