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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:25:04                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              246/Williamson                                            VRSN:      W
                                                        246-912/Thrall ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               13,155,144        0.8836            14,888,121               9              597         .021838352
      2           A                7,093,688        1.0265             6,910,558               7              186         .011477051
      3           A               10,106,073        0.9994            10,112,140              11              144         .003635943
      4           A               10,114,718        0.9898            10,218,951              12               87         .017556726
      5           D3              54,178,517        1.0255            52,831,318              22            2,312         .048698207
  RANDOM TOTALS:                  94,648,140                          94,961,088              61            3,326
  CATG J  EXCEPTION VALUES:        9,389,239                           9,387,991
  CATG D1 EXCEPTION VALUES:       14,501,549                          15,749,201
 TOTAL TEST VALUES (4):          118,538,928                         120,098,280
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:            6,004,914
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            114,093,366 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             118,538,928 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            126,103,194 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             122,172,455 (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