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DATE: 02/10/2005                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 12:18:22                                       2004 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              189/Presidio                                              VRSN:      P
                                                        189-901/Marfa ISD
____________________________________________________________________________________________________________________________________
         (1)           (1)                (1)              (1)                (1)              (2)            (3)
      # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE      SAMPLE SIZE    TOTAL PARCELS
      _________     ________          ___________     _____________       ___________      ___________    _____________

           1           A                7,717,365        0.9276             8,319,712               16              385
           2           A                7,728,068        0.9925             7,786,466               16              216
           3           A                7,774,050        0.9149             8,497,158               16              144
           4           A                7,670,986        0.9994             7,675,591               16               84
           5           D3              10,381,409        1.0218            10,159,923               20            4,697
           6           F1               2,407,469        0.9703             2,481,159               10               72
           7           F1               2,519,509        0.9756             2,582,523               10               27
           8           F1               4,625,640        0.9975             4,637,233                9               10
  RANDOM TOTALS:                       50,824,496                          52,139,765              113            5,635
  CATG J  EXCEPTION VALUES:            15,607,481                          16,079,049
  CATG D1 EXCEPTION VALUES:            13,015,340                          15,705,994
 TOTAL TEST VALUES (4):                79,447,317                          83,924,808
 MARGIN OF ERROR PERCENT:               5.0000000
 MARGIN OF ERROR VALUE:                 4,196,240
 CONFIDENCE INTERVAL VALUES (5):
   LOCAL TEST VALUE:                   79,447,317 (OUTSIDE CONFIDENCE INTERVAL)
   STATE LOWER LIMIT:                  79,728,568 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   STATE UPPER LIMIT:                  88,121,048 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):                  100,208,727 (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