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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:44:13                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              253/Zapata                                                VRSN:      W
                                                        253-901/Zapata ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              161,702,500        0.9504           170,141,519              43            5,164         .043987167
      2           D3              13,697,972        0.8965            15,279,389              11            3,830         .087801669
      3           G1             474,240,886        0.9558           496,171,674               7              752         .117659551
      4           G1             475,268,216        1.0035           473,610,579               7              279         .010620255
      5           G1             474,999,556        1.0211           465,184,170               7              153         .002526999
      6           G1             472,281,573        0.9825           480,693,713               6               63         .007795102
  RANDOM TOTALS:               2,072,190,703                       2,101,081,044              81           10,241
  CATG D1 EXCEPTION VALUES:       25,508,883                          53,305,578
 TOTAL TEST VALUES (4):        2,097,699,586                       2,154,386,622
 MARGIN OF ERROR PERCENT:          6.4053503
 MARGIN OF ERROR VALUE:          137,996,009
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          2,016,390,613 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           2,097,699,586 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          2,292,382,631 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           2,358,257,422 (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