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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     12:41                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        005-904-005 Windthorst

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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          3,561,183     .9985       3,566,533       15
  2      A  - Single-family Residences          3,552,265     .9572       3,711,100       14
  3      A  - Single-family Residences          3,486,868     .9632       3,620,087       14
  4      A  - Single-family Residences          3,528,485     .9830       3,589,507       12
  5      D  - Rural Real                       16,422,540     .9948      16,508,384       22
  6      G  - Oil, Gas, Minerals                1,827,110    1.0174       1,795,862       12

Random Totals:                                 32,378,451                32,791,473       89
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       5,434,710                 5,283,579
 Other Exception Values:                                0                         0
Exception Totals(3):                            5,434,710                 5,283,579
Test Values(4):                                37,813,161                38,075,052

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      1,903,753
Confidence Interval Values:
  State Lower Limit:                                       36,171,299  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        37,813,161  (Within Confidence Interval Limits)
  State Upper Limit:                                       39,978,805  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        39,448,618  (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.