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DATE: 01/30/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 08:11:27                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              236/Walker                                                VRSN:      W
                                                        236-902/Huntsville ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              175,498,575        0.7890           222,431,654               8            3,418         .033405827
      2           A              175,505,166        0.9078           193,330,212              12            1,775         .008555996
      3           A              175,460,175        0.9399           186,679,620              11            1,252         .009758652
      4           A              175,372,186        0.9328           188,006,203               8              811         .011259512
      5           B               24,239,402        0.8128            29,822,099               8               94         .020180800
      6           B               25,908,948        0.7775            33,323,406               5               17         .041597608
      7           B               25,178,150        0.8395            29,991,840               4                7         .007487467
      8           B               21,566,666        0.7442            28,979,664               2                3         .106913243
      9           D3             167,462,741        0.8244           203,132,874              16            7,303         .024365555
     10           F1              44,027,419        0.9019            48,816,298               7              310         .013583537
     11           F1              44,162,121        0.9187            48,070,231               6               88         .006712916
     12           F1              45,242,386        1.0008            45,206,221               6               35         .011030163
     13           F1              41,956,885        0.9322            45,008,458               4               10         .009678825
     14           L1              30,855,670        1.0077            30,619,897               7              336         .199402556
     15           L1              31,613,011        1.2223            25,863,545               6               58         .061281230
     16           L1              30,146,027        1.1273            26,741,796               6               15         .050036798
  RANDOM TOTALS:               1,234,195,528                       1,386,024,018             116           15,532
  CATG D1 EXCEPTION VALUES:       41,682,431                          38,512,758
  CATG L1 EXCEPTION VALUES:       38,379,560                          30,928,491
 TOTAL TEST VALUES (4):        1,314,257,519                       1,455,465,267
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:           72,773,263
 CONFIDENCE INTERVAL VALUES (5):
   LOCAL TEST VALUE:           1,314,257,519 (OUTSIDE CONFIDENCE INTERVAL)
   STATE LOWER LIMIT:          1,382,692,004 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   STATE UPPER LIMIT:          1,528,238,530 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           1,278,136,064 (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