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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:39:29                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              227/Travis                                                VRSN:      W
                                                        227-910/Del Valle ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              146,931,819        0.8986           163,511,929              28            2,133         .025007385
      2           A              147,091,239        0.9944           147,919,589              18            1,396         .017692887
      3           A              146,710,522        0.9225           159,035,796              16            1,146         .011116714
      4           A              146,801,090        0.9903           148,239,008               7              794         .008447582
      5           B               73,133,832        0.8738            83,696,306               7               83         .003713416
      6           B               62,946,671        0.8697            72,377,453               5                7         .016580675
      7           B               77,911,379        0.7860            99,123,892               4                5         .012616852
      8           D3             137,236,840        0.7094           193,454,807              24            3,717         .870324973
      9           F1              76,074,501        1.0122            75,157,579               7              185         .041644593
     10           F1              74,589,340        0.9312            80,100,236               6               46         .014095312
     11           F1              77,437,114        0.8733            88,671,836               6               20         .021744110
     12           F1              73,158,945        0.9553            76,582,168               5                8         .005324826
     13           L1              77,342,004        0.9263            83,495,632               7              257         .005316011
     14           L1              77,370,368        0.9290            83,283,496               6               45         .007075638
     15           L1              85,120,330        0.9811            86,760,096               6               19         .012633723
     16           L1              68,797,983        1.0562            65,137,269               3                5         .004614636
  RANDOM TOTALS:               1,548,653,977                       1,706,547,092             155            9,866
  CATG D1 EXCEPTION VALUES:        9,321,782                           9,492,731
  CATG B  EXCEPTION VALUES:       50,393,436                          58,162,724
 TOTAL TEST VALUES (4):        1,608,369,195                       1,774,202,547
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:           88,710,127
 CONFIDENCE INTERVAL VALUES (5):
   LOCAL TEST VALUE:           1,608,369,195 (OUTSIDE CONFIDENCE INTERVAL)
   STATE LOWER LIMIT:          1,685,492,420 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   STATE UPPER LIMIT:          1,862,912,674 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           2,111,921,484 (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