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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     13:50                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        068-901-068 Ector County

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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        390,068,717     .9328     418,169,722       21
  2      A  - Single-family Residences        390,068,717     .9215     423,297,577       25
  3      A  - Single-family Residences        390,068,717     .9826     396,976,101       27
  4      A  - Single-family Residences        390,068,717     .9578     407,254,873       20
  5      F  - Commercial Real                 142,420,546     .9545     149,209,582       35
  6      F  - Commercial Real                 142,600,445     .9935     143,533,412       11
  7      F  - Commercial Real                 142,660,412     .9279     153,745,460       11
  8      F  - Commercial Real                 142,000,780     .9328     152,230,682        8
  9      G  - Oil, Gas, Minerals              925,246,622     .9606     963,196,567       15
 10      L  - Commercial Personal             117,482,185    1.1101     105,830,272        7
 11      L  - Commercial Personal             117,877,581     .9960     118,350,985        8
 12      L  - Commercial Personal             116,839,666    1.0023     116,571,551        8
 13      L  - Commercial Personal             117,333,911    1.0569     111,017,041        9

Random Totals:                              3,524,737,016             3,659,383,825      205
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       2,903,722                 3,557,565
 Other Exception Values:                      256,429,766               248,319,731
Exception Totals(3):                          259,333,488               251,877,296
Test Values(4):                             3,784,070,504             3,911,261,121

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                    195,563,056
Confidence Interval Values:
  State Lower Limit:                                    3,715,698,065  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     3,784,070,504  (Within Confidence Interval Limits)
  State Upper Limit:                                    4,106,824,177  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     4,552,508,051  (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.