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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     12:38                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        002-901-002 Andrews

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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         39,718,396    1.0203      38,928,154       17
  2      A  - Single-family Residences         39,785,290     .9738      40,855,710       15
  3      A  - Single-family Residences         39,684,949     .9373      42,339,645       21
  4      A  - Single-family Residences         39,684,949     .9813      40,441,199       15
  5      G  - Oil, Gas, Minerals            1,374,505,190     .9717   1,414,536,575       27

Random Totals:                              1,533,378,774             1,577,101,283       95
 Cat J Exception Values:                       35,699,249                36,022,095
 Cat D1 Exception Values:                       8,154,360                15,475,329
 Other Exception Values:                                0                         0
Exception Totals(3):                           43,853,609                51,497,424
Test Values(4):                             1,577,232,383             1,628,598,707

Margin of Error Percent:                                    8.8182169
Margin of Error Value:                                    143,613,366
Confidence Interval Values:
  State Lower Limit:                                    1,484,985,341  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     1,577,232,383  (Within Confidence Interval Limits)
  State Upper Limit:                                    1,772,212,073  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     1,761,919,303  (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.