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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:34:26                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              198/Robertson                                             VRSN:      W
                                                        198-906/Mumford ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           D3               2,033,240        0.9999             2,033,443              12              222         .031809975
      2           G1               7,015,793        0.9509             7,378,056               5               19         .010200260
      3           G1               6,433,929        1.0285             6,255,643               4                8         .016806695
      4           G1               7,170,394        1.1181             6,413,017               3                5         .036219127
  RANDOM TOTALS:                  22,653,356                          22,080,159              24              254
  CATG J  EXCEPTION VALUES:        4,229,210                           4,168,803
  CATG D1 EXCEPTION VALUES:        4,631,310                           5,451,213
  CATG G1 EXCEPTION VALUES:        5,484,153                           5,663,138
 TOTAL TEST VALUES (4):           36,998,029                          37,363,313
 MARGIN OF ERROR PERCENT:          5.0000009
 MARGIN OF ERROR VALUE:            1,868,166
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:             35,495,147 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:              36,998,029 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:             39,231,479 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):              44,700,597 (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