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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:51                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        221-912-221 Wylie

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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        107,611,019     .9909     108,599,272        8
  2      A  - Single-family Residences        107,565,728    1.0100     106,500,721        7
  3      A  - Single-family Residences        107,611,019    1.0097     106,577,220       13
  4      A  - Single-family Residences        107,565,728     .9618     111,837,937        7
  5      D  - Rural Real                       99,193,069     .9429     105,199,988        9
  6      F  - Commercial Real                  12,504,979    1.0302      12,138,399        9
  7      F  - Commercial Real                  13,841,056    1.1364      12,179,740        8
  8      F  - Commercial Real                  12,950,338    1.0608      12,208,086        3
  9      L  - Commercial Personal               6,912,519    1.0363       6,670,384       11
 10      L  - Commercial Personal               7,152,414     .9949       7,189,078        6
 11      L  - Commercial Personal               6,779,245     .9914       6,838,052        5
 12      L  - Commercial Personal               6,357,208    1.0367       6,132,158        2

Random Totals:                                596,044,322               602,071,035       88
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       5,669,157                 5,644,686
 Other Exception Values:                       46,696,056                48,826,777
Exception Totals(3):                           52,365,213                54,471,463
Test Values(4):                               648,409,535               656,542,498

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     32,827,125
Confidence Interval Values:
  State Lower Limit:                                      623,715,373  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       648,409,535  (Within Confidence Interval Limits)
  State Upper Limit:                                      689,369,623  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       663,583,932  (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.