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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     17:13                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        243-903-243 Iowa Park CISD

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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         51,666,916     .9597      53,836,528       15
  2      A  - Single-family Residences         51,710,425     .9842      52,540,566       38
  3      A  - Single-family Residences         51,645,161     .9642      53,562,706       45
  4      A  - Single-family Residences         51,666,916     .9860      52,400,523       35
  5      D  - Rural Real                       19,826,990    1.0207      19,424,895       23
  6      G  - Oil, Gas, Minerals               19,073,595     .9981      19,109,904       25
  7      L  - Commercial Personal               4,576,366    1.0123       4,520,761        7
  8      L  - Commercial Personal               4,536,339     .9670       4,691,147        7
  9      L  - Commercial Personal               4,637,358     .9897       4,685,620        6
 10      L  - Commercial Personal               4,368,609     .9953       4,389,238        5

Random Totals:                                263,708,675               269,161,888      206
 Cat J Exception Values:                       17,365,248                17,523,260
 Cat D1 Exception Values:                      11,696,684                10,200,182
 Other Exception Values:                        6,502,165                 6,269,397
Exception Totals(3):                           35,564,097                33,992,839
Test Values(4):                               299,272,772               303,154,727

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     15,157,736
Confidence Interval Values:
  State Lower Limit:                                      287,996,991  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       299,272,772  (Within Confidence Interval Limits)
  State Upper Limit:                                      318,312,463  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       370,967,017  (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.