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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     21:17                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        224-901-224 Throckmorton

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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          2,486,266     .9453       2,630,134        7
  2      A  - Single-family Residences          2,470,642     .9723       2,541,028       10
  3      A  - Single-family Residences          2,486,266    1.0046       2,474,882        9
  4      A  - Single-family Residences          2,459,185    1.0193       2,412,621        9
  5      D  - Rural Real                        7,179,470     .9356       7,673,653       21
  6      G  - Oil, Gas, Minerals               30,024,360    1.0129      29,641,978       19

Random Totals:                                 47,106,189                47,374,296       75
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                      21,396,340                22,309,481
 Other Exception Values:                                0                         0
Exception Totals(3):                           21,396,340                22,309,481
Test Values(4):                                68,502,529                69,683,777

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      3,484,189
Confidence Interval Values:
  State Lower Limit:                                       66,199,588  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        68,502,529  (Within Confidence Interval Limits)
  State Upper Limit:                                       73,167,966  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        75,024,876  (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.