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DATE: 06/22/2005                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:54:54                                       2004 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              022/Brewster                                              VRSN:      W
                                                        022-902/Marathon ISD
____________________________________________________________________________________________________________________________________
         (1)           (1)                (1)              (1)                (1)              (2)            (3)
      # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE      SAMPLE SIZE    TOTAL PARCELS
      _________     ________          ___________     _____________       ___________      ___________    _____________

           1           A                2,791,589        0.9049             3,084,970               15              115
           2           A                2,754,393        1.0125             2,720,388               14               60
           3           A                2,824,971        1.1244             2,512,425               14               38
           4           A                2,748,972        1.0869             2,529,186               11               18
           5           D3               7,639,667        0.9883             7,730,109               24              605
           6           F1                 710,754        0.8540               832,265                5               22
           7           F1                 712,339        1.0408               684,415                4                9
           8           F1                 708,727        0.9742               727,496                3                4
  RANDOM TOTALS:                       20,891,412                          20,821,254               90              871
  CATG J  EXCEPTION VALUES:            12,618,740                          12,863,964
  CATG D1 EXCEPTION VALUES:            12,949,370                          15,537,298
  CATG F1 EXCEPTION VALUES:               495,166                             486,502
 TOTAL TEST VALUES (4):                46,954,688                          49,709,018
 MARGIN OF ERROR PERCENT:               5.0000002
 MARGIN OF ERROR VALUE:                 2,485,451
 CONFIDENCE INTERVAL VALUES (5):
   LOCAL TEST VALUE:                   46,954,688 (OUTSIDE CONFIDENCE INTERVAL)
   STATE LOWER LIMIT:                  47,223,567 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   STATE UPPER LIMIT:                  52,194,469 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):                   48,168,879 (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