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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     14:05                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        082-902-082 Dilley

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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          5,587,699     .9742       5,735,680        7
  2      A  - Single-family Residences          5,568,885    1.0289       5,412,465        6
  3      A  - Single-family Residences          5,608,864     .9780       5,735,035        8
  4      A  - Single-family Residences          5,557,126     .9406       5,908,065        8
  5      D  - Rural Real                       14,554,380     .9472      15,365,688       10
  6      F  - Commercial Real                   1,866,905     .9905       1,884,811        7
  7      F  - Commercial Real                   1,892,331    1.0141       1,866,020        6
  8      F  - Commercial Real                   1,910,052     .9678       1,973,602        4
  9      G  - Oil, Gas, Minerals                5,345,810    1.1403       4,688,073       12

Random Totals:                                 47,892,052                48,569,439       68
 Cat J Exception Values:                        7,813,114                 8,190,026
 Cat D1 Exception Values:                      19,717,610                21,456,068
 Other Exception Values:                        1,428,390                 1,524,326
Exception Totals(3):                           28,959,114                31,170,420
Test Values(4):                                76,851,166                79,739,859

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      3,986,993
Confidence Interval Values:
  State Lower Limit:                                       75,752,866  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        76,851,166  (Within Confidence Interval Limits)
  State Upper Limit:                                       83,726,852  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        90,465,937  (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.