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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:21                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        186-902-186 Ft Stockton

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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         27,054,664    1.0967      24,669,157       12
  2      A  - Single-family Residences         27,054,664     .9714      27,851,209       10
  3      A  - Single-family Residences         27,077,437     .9098      29,761,966       10
  4      A  - Single-family Residences         26,997,731     .9645      27,991,427       10
  5      G  - Oil, Gas, Minerals              776,941,890    1.0120     767,729,140       41

Random Totals:                                885,126,386               878,002,899       83
 Cat J Exception Values:                       28,637,836                29,306,139
 Cat D1 Exception Values:                      15,717,440                22,558,739
 Other Exception Values:                                0                         0
Exception Totals(3):                           44,355,276                51,864,878
Test Values(4):                               929,481,662               929,867,777

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     46,493,389
Confidence Interval Values:
  State Lower Limit:                                      883,374,388  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       929,481,662  (Within Confidence Interval Limits)
  State Upper Limit:                                      976,361,166  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     1,081,550,483  (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.