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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:55:59                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              014/Bell                                                  VRSN:      W
                                                        014-910/Troy ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               21,589,570        0.9899            21,809,849              19              407         .045557267
      2           A               21,592,296        0.9528            22,661,940              12              267         .020872670
      3           A               21,657,237        0.9335            23,200,040              13              194         .014054555
      4           A               21,456,379        1.0434            20,563,906              12              129         .027946816
      5           D3              61,103,144        0.9505            64,285,265              22            2,380         .038509608
      6           F1               1,462,103        0.7952             1,838,661               7               34         .045273410
      7           F1               1,390,774        0.7791             1,785,103               7               15         .323204983
      8           F1               2,771,973        0.8765             3,162,548               5                9         .002962967
      9           L1               2,065,992        1.0418             1,983,098               7              102         .008064918
     10           L1               2,103,852        0.9512             2,211,787               6               14         .050556691
  RANDOM TOTALS:                 157,193,320                         163,502,197             110            3,551
  CATG J  EXCEPTION VALUES:       11,785,613                          12,710,786
  CATG D1 EXCEPTION VALUES:       10,133,490                           9,447,613
  CATG F1 EXCEPTION VALUES:        5,939,510                           5,631,956
  CATG L1 EXCEPTION VALUES:        4,711,528                           4,654,228
 TOTAL TEST VALUES (4):          189,763,461                         195,946,780
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:            9,797,339
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            186,149,441 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             189,763,461 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            205,744,119 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             175,949,675 (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