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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:19:19                                       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            1,065,802,902        0.9691         1,099,786,299              51            6,618         .001599805
      2           A            1,065,451,374        0.9799         1,087,306,229              51            4,566         .002409555
      3           A            1,065,341,247        0.9767         1,090,755,859              47            3,239         .008304256
      4           A            1,065,011,890        0.9779         1,089,080,571              51            1,881         .001289096
      5           B              126,008,729        1.1418           110,359,721              12              830         .003515415
      6           B              134,383,995        0.8656           155,249,532               7               17         .068782475
      7           B              123,589,459        0.9545           129,480,837               5                7         .002344368
      8           F1             464,845,736        0.8950           519,380,711               7              436         .010666473
      9           F1             462,059,497        0.9012           512,715,820               7              120         .020842188
     10           F1             484,096,897        0.9333           518,693,772               6               37         .004373609
     11           L1             570,218,569        1.0624           536,726,816               7              416         .003385059
     12           L1             582,462,281        1.1053           526,972,117               7               17         .016584640
     13           L1             593,797,882        1.0000           593,797,882               3                5
  RANDOM TOTALS:               7,803,070,458                       7,970,306,166             261           18,189
  CATG D1 EXCEPTION VALUES:          115,760                             123,248
  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):        9,067,363,332                       9,232,918,914
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          461,645,946
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          8,771,272,968 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           9,067,363,332 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          9,694,564,860 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           8,455,080,525 (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