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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     15:25                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        142-901-142 Cotulla

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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         30,216,625     .8771      34,450,604       10
  2      D  - Rural Real                       10,474,080     .9227      11,351,555        9
  3      F  - Commercial Real                  12,716,305     .9832      12,933,589       10
  4      G  - Oil, Gas, Minerals               77,721,544    1.0324      75,282,394       27

Random Totals:                                131,128,554               134,018,142       56
 Cat J Exception Values:                       18,324,660                18,820,918
 Cat D1 Exception Values:                      48,267,474                58,242,461
 Other Exception Values:                                0                         0
Exception Totals(3):                           66,592,134                77,063,379
Test Values(4):                               197,720,688               211,081,521

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     10,554,076
Confidence Interval Values:
  Local Test Value:                                       197,720,688  (Outside of ConfidenceInterval Limits)
  State Lower Limit:                                      200,527,445  (State Test Value Minus Margin of Error Value)
  State Upper Limit:                                      221,635,597  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       214,782,831  (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.