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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:37:45                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              220/Tarrant                                               VRSN:      W
                                                        220-906/Grapevine-Colleyville ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A            1,065,790,636        0.9691         1,099,773,642              51            6,618         .001599805
      2           A            1,065,439,112        0.9799         1,087,293,716              51            4,566         .002409555
      3           A            1,065,328,986        0.9767         1,090,743,305              47            3,239         .008304256
      4           A            1,064,999,634        0.9779         1,089,068,038              51            1,881         .001289096
      5           B              122,626,723        1.1418           107,397,726              12              830         .003515415
      6           B              130,777,202        0.8656           151,082,720               7               17         .068782475
      7           B              120,272,385        0.9545           126,005,642               5                7         .002344368
      8           F1             466,222,072        0.8950           520,918,516               7              436         .010666473
      9           F1             463,427,582        0.9012           514,233,890               7              120         .020842188
     10           F1             485,530,232        0.9333           520,229,542               6               37         .004373609
     11           L1             572,116,225        1.0624           538,513,013               7              416         .003385059
     12           L1             584,400,684        1.1053           528,725,852               7               17         .016584640
     13           L1             595,774,009        1.0000           595,774,009               3                5
  RANDOM TOTALS:               7,802,705,482                       7,969,759,611             261           18,189
  CATG D1 EXCEPTION VALUES:          119,359                             126,239
  CATG B  EXCEPTION VALUES:      160,390,251                         163,697,115
  CATG F1 EXCEPTION VALUES:      435,716,998                         435,484,482
  CATG L1 EXCEPTION VALUES:      668,069,865                         663,307,903
 TOTAL TEST VALUES (4):        9,067,001,955                       9,232,375,350
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          461,618,768
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          8,770,756,582 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           9,067,001,955 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          9,693,994,118 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           8,489,100,469 (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