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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:32:42                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              187/Polk                                                  VRSN:      W
                                                        187-901/Big Sandy ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A                5,291,727        0.8201             6,452,539               7              291         .072724324
      2           A                5,297,957        1.0269             5,159,175               7              141         .167362615
      3           A                5,239,968        0.9035             5,799,633               6               81         .067877120
      4           A                5,274,304        1.0982             4,802,681               6               44         .060935339
      5           D3              10,195,714        0.9983            10,213,076              10            1,261         .009052503
      6           G1              62,507,238        0.9734            64,215,367               5               16         .008165402
      7           G1              66,556,348        0.9779            68,060,485               4                7         .008004730
      8           G1              59,798,502        0.9868            60,598,401               3                4         .006496236
  RANDOM TOTALS:                 220,161,758                         225,301,357              48            1,845
  CATG D1 EXCEPTION VALUES:       26,428,774                          26,672,652
  CATG G1 EXCEPTION VALUES:       47,047,846                          43,638,665
 TOTAL TEST VALUES (4):          293,638,378                         295,612,674
 MARGIN OF ERROR PERCENT:          5.0000001
 MARGIN OF ERROR VALUE:           14,780,634
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            280,832,040 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             293,638,378 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            310,393,308 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             280,077,938 (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