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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:50                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        220-902-220 Birdville

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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        865,535,461     .9391     921,664,850       50
  2      A  - Single-family Residences        861,176,911    1.0007     860,574,509       51
  3      A  - Single-family Residences        860,813,698     .9781     880,087,617       51
  4      A  - Single-family Residences        861,540,123     .9969     864,219,203       51
  5      B  - Multi-family Residences         106,230,493     .9698     109,538,557       24
  6      B  - Multi-family Residences         102,913,518    1.0228     100,619,396        6
  7      B  - Multi-family Residences         111,642,400    1.0088     110,668,517        6
  8      B  - Multi-family Residences          93,791,837     .9966      94,111,817        4
  9      F  - Commercial Real                 308,824,106    1.0299     299,858,342        6
 10      F  - Commercial Real                 309,863,481    1.0691     289,835,825        8
 11      F  - Commercial Real                 309,993,402     .9372     330,765,474        7
 12      F  - Commercial Real                 305,705,983     .8182     373,632,343        8
 13      L  - Commercial Personal             160,680,517     .9565     167,987,995        8
 14      L  - Commercial Personal             161,626,889    1.0189     158,628,805        9
 15      L  - Commercial Personal             159,396,154     .9952     160,164,946        8
 16      L  - Commercial Personal             160,545,321    1.0549     152,190,085        6

Random Totals:                              5,740,280,294             5,874,548,281      303
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                          54,783                    47,049
 Other Exception Values:                                0                         0
Exception Totals(3):                               54,783                    47,049
Test Values(4):                             5,740,335,077             5,874,595,330

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                    293,729,767
Confidence Interval Values:
  State Lower Limit:                                    5,580,865,563  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     5,740,335,077  (Within Confidence Interval Limits)
  State Upper Limit:                                    6,168,325,097  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     5,797,001,057  (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.