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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:23:08                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              240/Webb                                                  VRSN:      W
                                                        240-901/Laredo ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              237,189,005        0.9330           254,221,870              21            6,248         .047312754
      2           A              237,137,401        0.8622           275,037,579              19            4,038         .023997372
      3           A              237,262,619        0.9663           245,537,223              14            2,915         .033743348
      4           A              236,988,629        1.0086           234,967,905              12            1,782         .011449503
      5           B               28,042,699        0.9319            30,091,962               7              217         .021101180
      6           B               27,897,190        0.9213            30,280,245               8              129         .005961635
      7           B               28,148,241        0.9331            30,166,371               7               75         .003274253
      8           B               27,450,315        0.9047            30,341,898               6               28         .002412057
      9           F1             130,340,208        0.9705           134,302,121               8              958         .022564813
     10           F1             130,062,788        1.0200           127,512,537               8              336         .011802351
     11           F1             133,482,586        0.9296           143,591,422               8              125         .001893523
     12           F1             126,693,198        0.9607           131,875,922               4                7         .002106515
     13           L1              39,353,961        0.9817            40,087,563               7              872         .006338467
     14           L1              39,248,946        0.9912            39,597,403               7              220         .021349931
     15           L1              39,344,360        1.0214            38,520,031               6               62         .004139454
     16           L1              39,169,560        0.9115            42,972,639               4                8         .002286728
  RANDOM TOTALS:               1,737,811,706                       1,829,104,691             146           18,020
  CATG D1 EXCEPTION VALUES:           16,570                              20,690
 TOTAL TEST VALUES (4):        1,737,828,276                       1,829,125,381
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:           91,456,269
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          1,737,669,112 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           1,737,828,276 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          1,920,581,650 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           1,723,802,592 (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