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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     14:56                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        118-902-118 Irion 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          5,556,833     .9336       5,952,049        8
  2      A  - Single-family Residences          5,570,847     .9666       5,763,343       10
  3      A  - Single-family Residences          5,535,810     .7795       7,101,745        5
  4      A  - Single-family Residences          5,540,482     .8256       6,710,855       14
  5      D  - Rural Real                        6,376,060     .9183       6,943,330       15
  6      G  - Oil, Gas, Minerals              128,919,600    1.0184     126,590,338       41

Random Totals:                                157,499,632               159,061,660       93
 Cat J Exception Values:                        6,858,550                 7,808,025
 Cat D1 Exception Values:                      13,095,520                14,658,921
 Other Exception Values:                                0                         0
Exception Totals(3):                           19,954,070                22,466,946
Test Values(4):                               177,453,702               181,528,606

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      9,076,430
Confidence Interval Values:
  State Lower Limit:                                      172,452,176  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       177,453,702  (Within Confidence Interval Limits)
  State Upper Limit:                                      190,605,036  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       216,874,413  (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.