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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:43:41                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              057/Dallas                                                VRSN:      W
                                                        057-912/Irving ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              893,965,079        0.9972           896,475,210              46            9,691         .003027504
      2           A              893,928,599        0.9910           902,047,022              44            7,689         .004172261
      3           A              893,757,983        0.9944           898,791,214              50            5,961         .002191480
      4           A              893,881,252        1.0002           893,702,511              49            2,782         .001775805
      5           B              207,377,315        1.0144           204,433,473              19              477         .000925293
      6           B              208,164,077        0.9468           219,860,664               6               44         .047810396
      7           B              205,971,485        0.9830           209,533,555               5               25         .000530484
      8           B              204,420,004        0.8798           232,348,266               4               11         .022343897
      9           F1             545,409,505        1.0136           538,091,461              21              812         .004263026
     10           F1             541,328,101        0.9555           566,539,091              10              159         .009648961
     11           F1             559,948,932        0.8365           669,395,017               9               45         .056449758
     12           F1             521,051,730        0.9112           571,830,257               6               12         .011106122
     13           L1             234,617,545        1.0245           229,006,877               7            1,167         .147205734
     14           L1             235,023,667        1.0529           223,215,564               7              219         .013384970
     15           L1             234,347,851        1.0097           232,096,515               7               82         .003758378
     16           L1             233,579,068        1.0313           226,489,933               6               23         .005963237
  RANDOM TOTALS:               7,506,772,193                       7,713,856,630             296           29,199
  CATG D1 EXCEPTION VALUES:          124,057                              98,021
 TOTAL TEST VALUES (4):        7,506,896,250                       7,713,954,651
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          385,697,733
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          7,328,256,918 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           7,506,896,250 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          8,099,652,384 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           7,853,650,035 (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