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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:36                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        207-901-207 Schleicher County

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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      A  - Single-family Residences          4,060,410    1.0021       4,051,901        9
  2      A  - Single-family Residences          4,053,578     .8832       4,589,649        9
  3      A  - Single-family Residences          4,084,325     .8518       4,794,934        9
  4      A  - Single-family Residences          4,033,079     .8778       4,594,531        9
  5      D  - Rural Real                       12,580,360     .8475      14,844,083       16
  6      G  - Oil, Gas, Minerals               89,376,690    1.0318      86,622,107       33

Random Totals:                                118,188,442               119,497,205       85
 Cat J Exception Values:                        7,270,530                 8,581,944
 Cat D1 Exception Values:                      27,240,770                30,446,509
 Other Exception Values:                                0                         0
Exception Totals(3):                           34,511,300                39,028,453
Test Values(4):                               152,699,742               158,525,658

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      7,926,283
Confidence Interval Values:
  State Lower Limit:                                      150,599,375  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       152,699,742  (Within Confidence Interval Limits)
  State Upper Limit:                                      166,451,941  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       196,820,457  (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.