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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:09:05                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              168/Mitchell                                              VRSN:      W
                                                        168-903/Westbrook ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A                3,724,479        0.9559             3,896,306               7              222         .008251342
      2           A                3,735,190        1.0746             3,475,889               7              123         .029855716
      3           A                3,723,579        0.9305             4,001,697               7               83         .016521533
      4           A                3,694,354        1.0570             3,495,132               6               47         .009118690
      5           D3               4,044,900        0.9804             4,125,765              11            1,043         .003180756
      6           G1              18,712,569        0.9972            18,765,111               4               11         .003010159
  RANDOM TOTALS:                  37,635,071                          37,759,900              42            1,529
  CATG J  EXCEPTION VALUES:        7,770,408                           7,849,881
  CATG D1 EXCEPTION VALUES:        8,563,390                           9,386,732
  CATG G1 EXCEPTION VALUES:      145,766,523                         138,666,843
 TOTAL TEST VALUES (4):          199,735,392                         193,663,356
 MARGIN OF ERROR PERCENT:          5.0000001
 MARGIN OF ERROR VALUE:            9,683,168
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            183,980,188 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             199,735,392 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            203,346,524 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             215,325,840 (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