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DATE: 02/10/2005                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:56:25                                       2004 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              039/Clay                                                  VRSN:      P
                                                        039-903/Petrolia ISD
____________________________________________________________________________________________________________________________________
         (1)           (1)                (1)              (1)                (1)              (2)            (3)
      # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE      SAMPLE SIZE    TOTAL PARCELS
      _________     ________          ___________     _____________       ___________      ___________    _____________

           1           A                7,696,778        1.0560             7,288,616                8              254
           2           A                7,702,826        0.9681             7,956,643                8              136
           3           A                7,621,239        0.9725             7,836,750                9               93
           4           A                7,692,928        0.9888             7,780,065                9               58
           5           D3              15,021,650        1.0225            14,691,100               14            1,258
  RANDOM TOTALS:                       45,735,421                          45,553,174               48            1,799
  CATG J  EXCEPTION VALUES:             4,402,190                           4,082,518
  CATG D1 EXCEPTION VALUES:             8,577,600                           8,176,919
 TOTAL TEST VALUES (4):                58,715,211                          57,812,611
 MARGIN OF ERROR PERCENT:               5.0000008
 MARGIN OF ERROR VALUE:                 2,890,631
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:                  54,921,980 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:                   58,715,211 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:                  60,703,242 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):                   60,451,050 (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