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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:02:23                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              045/Colorado                                              VRSN:      W
                                                        045-902/Columbus ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              202,382,452        0.9725           208,105,349              37            2,514         .014608071
      2           D3             179,107,114        0.9698           184,684,589              55            6,065         .022084020
      3           F1              59,653,851        0.9072            65,756,009              11              404         .002874108
      4           G1              11,019,918        1.1251             9,794,612               5               19         .119052535
      5           G1               9,537,761        1.0222             9,330,621               3                6         .002147566
      6           G1              12,611,179        1.2262            10,284,765               3                4         .122928088
  RANDOM TOTALS:                 474,312,275                         487,955,945             114            9,012
  CATG J  EXCEPTION VALUES:       23,477,429                          24,153,996
  CATG D1 EXCEPTION VALUES:       24,095,600                          23,044,515
  CATG G1 EXCEPTION VALUES:        6,145,534                           6,149,506
 TOTAL TEST VALUES (4):          528,030,838                         541,303,962
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:           27,065,198
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            514,238,764 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             528,030,838 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            568,369,160 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             536,559,754 (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