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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     21:16                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        223-904-223 Wellman-Union CISD

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                                                              (1)                         (2)
  (1)                  (1)                        (1)       Stratum         (1)         Sample
Stratum              Category                 Local Value    Ratio      State Value      Size
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  1      D  - Rural Real                        5,361,226     .9874       5,429,639       20
  2      G  - Oil, Gas, Minerals               23,101,630     .9155      25,233,894       26

Random Totals:                                 28,462,856                30,663,533       46
 Cat J Exception Values:                        5,137,520                 4,940,547
 Cat D1 Exception Values:                      31,846,642                30,319,874
 Other Exception Values:                                0                         0
Exception Totals(3):                           36,984,162                35,260,421
Test Values(4):                                65,447,018                65,923,954

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      3,296,198
Confidence Interval Values:
  State Lower Limit:                                       62,627,756  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        65,447,018  (Within Confidence Interval Limits)
  State Upper Limit:                                       69,220,152  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        77,654,986  (See ISD Summary Worksheet)


Sources:

(1) See Stratified Ratio Detail Report VAL7214.
(2) Number of parcels sampled by staff.
(3) Exception value includes, if tested, D1, the J sample, and any parcels in A,B,C,D,F1,G or L1 marked as exception properties.
(4) Unstudied categories and sub-categories were not included in the test values.
(5) Includes local value of unstudied property categories and sub-categories.