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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:23:12                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              240/Webb                                                  VRSN:      W
                                                        240-904/Webb CISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           D3              18,314,020        0.9347            19,593,474              10            2,278         .009709587
      2           G1             238,689,300        0.9638           247,654,389               8              475         .002723522
      3           G1             239,738,259        1.0776           222,474,257               8              208         .008546746
      4           G1             239,000,080        1.0090           236,868,266               8              120         .012907013
      5           G1             236,633,861        0.9403           251,657,834               7               66         .023521556
  RANDOM TOTALS:                 972,375,520                         978,248,220              41            3,147
  CATG D1 EXCEPTION VALUES:       23,813,360                          36,943,553
 TOTAL TEST VALUES (4):          996,188,880                       1,015,191,773
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:           50,759,589
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            964,432,184 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             996,188,880 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          1,065,951,362 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           1,156,928,245 (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