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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     18:36                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        090-903-090 McLean

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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          8,481,740     .9193       9,226,303       10
  2      D  - Rural Real                        5,275,230     .8687       6,072,557       10
  3      G  - Oil, Gas, Minerals               45,679,650     .9925      46,024,836       17
  4      L  - Commercial Personal               9,183,561    1.0996       8,351,729        9

Random Totals:                                 68,620,181                69,675,425       46
 Cat J Exception Values:                        6,581,501                 6,045,877
 Cat D1 Exception Values:                       7,881,100                 8,939,362
 Other Exception Values:                                0                         0
Exception Totals(3):                           14,462,601                14,985,239
Test Values(4):                                83,082,782                84,660,664

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      4,233,033
Confidence Interval Values:
  State Lower Limit:                                       80,427,631  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        83,082,782  (Within Confidence Interval Limits)
  State Upper Limit:                                       88,893,697  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        90,497,679  (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.