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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     21:40                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        242-902-242 Shamrock

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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         24,452,820     .9193      26,599,391       19
  2      D  - Rural Real                        7,511,280    1.0177       7,380,643        8
  3      F  - Commercial Real                  13,410,190     .9729      13,783,729       12
  4      G  - Oil, Gas, Minerals               21,208,897     .9903      21,416,638       41
  5      L  - Commercial Personal               8,413,370    1.0731       7,840,248       10

Random Totals:                                 74,996,557                77,020,649       90
 Cat J Exception Values:                        6,750,550                 6,669,248
 Cat D1 Exception Values:                       7,967,250                10,303,231
 Other Exception Values:                        6,777,023                 6,885,752
Exception Totals(3):                           21,494,823                23,858,231
Test Values(4):                                96,491,380               100,878,880

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      5,043,944
Confidence Interval Values:
  State Lower Limit:                                       95,834,936  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        96,491,380  (Within Confidence Interval Limits)
  State Upper Limit:                                      105,922,824  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        97,866,510  (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.