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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:36:26                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              020/Brazoria                                              VRSN:      W
                                                        020-901/Alvin ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              439,242,164        0.9734           451,245,289              49            5,208         .000586590
      2           A              438,793,464        0.9764           449,399,287              48            3,377         .001630632
      3           A              438,910,741        0.9927           442,138,351              50            2,524         .001545442
      4           A              438,979,921        1.0178           431,302,732              50            1,609         .002550446
      5           C               53,482,909        0.9953            53,735,466               8            2,998         .001832147
      6           C               53,470,077        0.9812            54,494,575               8            1,244         .005569419
      7           C               53,351,781        0.9713            54,928,221               7              784         .011688775
      8           C               53,419,939        1.0408            51,325,845               8              189         .009064639
      9           D3             235,456,920        0.9911           237,571,305              10            6,491         .013899095
     10           F1              54,788,871        0.8890            61,629,776               9              469         .030247182
     11           F1              54,843,950        0.9292            59,022,762               7              159         .009687128
     12           F1              55,013,308        0.9082            60,574,001               6               65         .015783189
     13           F1              53,678,235        1.0064            53,336,879               5               18         .046017193
     14           L1              38,552,959        1.0161            37,942,091               7              460         .003698806
     15           L1              38,690,892        1.0221            37,854,312               7               96         .001810517
     16           L1              39,548,553        0.9778            40,446,465               6               33         .001117920
     17           L1              36,899,399        0.9422            39,163,022               4                9         .002635965
  RANDOM TOTALS:               2,577,124,083                       2,616,110,379             289           25,733
  CATG D1 EXCEPTION VALUES:       12,478,520                          12,422,763
 TOTAL TEST VALUES (4):        2,589,602,603                       2,628,533,142
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          131,426,657
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          2,497,106,485 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           2,589,602,603 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          2,759,959,799 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           2,611,740,343 (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