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DATE: 02/10/2005                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 12:15:06                                       2004 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              168/Mitchell                                              VRSN:      P
                                                        168-903/Westbrook ISD
____________________________________________________________________________________________________________________________________
         (1)           (1)                (1)              (1)                (1)              (2)            (3)
      # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE      SAMPLE SIZE    TOTAL PARCELS
      _________     ________          ___________     _____________       ___________      ___________    _____________

           1           A                3,756,434        0.9777             3,842,113                7              224
           2           A                3,796,801        0.9471             4,008,870               10              123
           3           A                3,764,978        0.9959             3,780,478                8               81
           4           A                3,736,291        1.0547             3,542,515                6               46
           5           D3               3,993,020        0.9521             4,193,908               13            1,032
           6           G1              37,578,290        1.0187            36,888,476               10              152
  RANDOM TOTALS:                       56,625,814                          56,256,360               54            1,658
  CATG J  EXCEPTION VALUES:             8,219,497                           8,880,049
  CATG D1 EXCEPTION VALUES:             8,620,000                          10,208,722
  CATG G1 EXCEPTION VALUES:            45,611,810                          45,295,898
 TOTAL TEST VALUES (4):               119,077,121                         120,641,029
 MARGIN OF ERROR PERCENT:               5.0000000
 MARGIN OF ERROR VALUE:                 6,032,051
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:                 114,608,978 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:                  119,077,121 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:                 126,673,080 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):                  124,414,950 (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