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DATE: 06/22/2005                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:57:33                                       2004 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              043/Collin                                                VRSN:      W
                                                        043-912/Prosper ISD
____________________________________________________________________________________________________________________________________
         (1)           (1)                (1)              (1)                (1)              (2)            (3)
      # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE      SAMPLE SIZE    TOTAL PARCELS
      _________     ________          ___________     _____________       ___________      ___________    _____________

           1           A               93,621,514        0.9944            94,148,747               59              600
           2           A               93,839,334        1.0198            92,017,390               56              450
           3           A               93,471,056        1.0019            93,293,798               55              277
           4           A               93,778,963        1.0061            93,210,380               18              161
           5           D3              83,192,928        1.1162            74,532,277               10           32,943
           6           F1              14,189,631        0.8565            16,566,995                8              109
           7           F1              14,679,035        1.0468            14,022,769                9               40
           8           F1              14,474,375        0.9363            15,459,121                5               13
           9           F1              13,298,635        1.0471            12,700,444                3                5
  RANDOM TOTALS:                      514,545,471                         505,951,921              223           34,598
  CATG D1 EXCEPTION VALUES:             4,315,064                           3,816,542
 TOTAL TEST VALUES (4):               518,860,535                         509,768,463
 MARGIN OF ERROR PERCENT:               5.0000000
 MARGIN OF ERROR VALUE:                25,488,423
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:                 484,280,040 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:                  518,860,535 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:                 535,256,886 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):                  621,094,657 (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