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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     15:21                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        138-902-138 Knox City-O'Brien CISD

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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          3,127,735    1.0680       2,928,591       15
  2      A  - Single-family Residences          3,150,048    1.0779       2,922,394       14
  3      A  - Single-family Residences          3,096,234     .9797       3,160,390       13
  4      A  - Single-family Residences          3,097,547     .9792       3,163,345       12
  5      D  - Rural Real                        3,518,670    1.0756       3,271,356       25
  6      G  - Oil, Gas, Minerals                9,709,870    1.0332       9,397,861       13
  7      L  - Commercial Personal               1,129,504    1.0028       1,126,350       12
  8      L  - Commercial Personal               1,117,884    1.0483       1,066,378        6
  9      L  - Commercial Personal               1,138,336     .9938       1,145,438        5

Random Totals:                                 29,085,828                28,182,103      115
 Cat J Exception Values:                        1,661,380                 1,795,087
 Cat D1 Exception Values:                      11,776,240                10,690,088
 Other Exception Values:                        3,109,220                 3,011,942
Exception Totals(3):                           16,546,840                15,497,117
Test Values(4):                                45,632,668                43,679,220

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      2,183,961
Confidence Interval Values:
  State Lower Limit:                                       41,495,259  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        45,632,668  (Within Confidence Interval Limits)
  State Upper Limit:                                       45,863,181  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        48,992,004  (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.