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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:26:21                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              254/Zavala                                                VRSN:      W
                                                        254-901/Crystal City ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               10,903,618        0.9773            11,156,879               7              801         .021489523
      2           A               10,910,165        0.9537            11,439,829               7              472         .010048023
      3           A               10,882,579        0.9981            10,903,295               8              329         .009315220
      4           A               10,885,382        0.9542            11,407,862               7              189         .003764489
      5           D3              20,755,824        0.8928            23,248,011              16            2,144         .091898362
      6           F1               2,851,247        0.9626             2,962,027               7               80         .002478448
      7           F1               2,948,895        0.9678             3,047,009               7               27         .008080967
      8           F1               2,756,095        0.9737             2,830,538               5                9         .001214162
      9           G1               7,214,587        1.0159             7,101,670               6               27         .005295133
     10           G1               7,162,912        1.0557             6,784,988               4                9         .043750539
     11           G1               8,880,266        0.9752             9,106,097               3                4         .009499029
  RANDOM TOTALS:                  96,151,570                          99,988,205              77            4,091
  CATG J  EXCEPTION VALUES:       10,624,449                          10,637,957
  CATG D1 EXCEPTION VALUES:       26,414,149                          27,002,175
  CATG F1 EXCEPTION VALUES:        2,647,589                           2,758,704
  CATG G1 EXCEPTION VALUES:       13,041,360                          12,141,059
 TOTAL TEST VALUES (4):          148,879,117                         152,528,100
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:            7,626,405
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            144,901,695 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             148,879,117 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            160,154,505 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             172,857,924 (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