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DATE: 02/10/2005                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 12:09:02                                       2004 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              118/Irion                                                 VRSN:      P
                                                        118-902/Irion County ISD
____________________________________________________________________________________________________________________________________
         (1)           (1)                (1)              (1)                (1)              (2)            (3)
      # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE      SAMPLE SIZE    TOTAL PARCELS
      _________     ________          ___________     _____________       ___________      ___________    _____________

           1           A                5,844,504        0.8835             6,615,171                8              215
           2           A                5,736,377        0.8107             7,075,832                9              118
           3           A                5,843,753        0.8325             7,019,523               10               82
           4           A                5,723,563        0.9213             6,212,486                8               51
           5           D3               6,525,650        0.9536             6,843,173               12            2,283
           6           G1             145,507,540        0.9819           148,189,775               23              780
  RANDOM TOTALS:                      175,181,387                         181,955,960               70            3,529
  CATG J  EXCEPTION VALUES:             7,751,730                           7,372,540
  CATG D1 EXCEPTION VALUES:            14,181,860                          15,237,547
 TOTAL TEST VALUES (4):               197,114,977                         204,566,047
 MARGIN OF ERROR PERCENT:               5.0000000
 MARGIN OF ERROR VALUE:                10,228,302
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:                 194,337,745 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:                  197,114,977 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:                 214,794,349 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):                  238,434,787 (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