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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:13                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        178-909-178 Robstown

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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         30,876,487     .8890      34,731,706       20
  2      A  - Single-family Residences         30,876,487     .9030      34,193,230       17
  3      A  - Single-family Residences         30,889,482     .9312      33,171,695       19
  4      A  - Single-family Residences         30,824,506     .9426      32,701,576       17
  5      D  - Rural Real                       11,310,409     .9997      11,313,803       13
  6      F  - Commercial Real                   7,732,721     .9324       8,293,352        9
  7      F  - Commercial Real                   7,706,902     .8933       8,627,451        7
  8      F  - Commercial Real                   7,839,223     .9062       8,650,654        6
  9      F  - Commercial Real                   7,387,395     .9501       7,775,387        4
 10      L  - Commercial Personal               5,194,241     .9279       5,597,846        7
 11      L  - Commercial Personal               5,261,166    1.0333       5,091,615        6
 12      L  - Commercial Personal               6,120,397     .9646       6,345,010        4

Random Totals:                                182,019,416               196,493,325      129
 Cat J Exception Values:                       13,415,195                14,350,797
 Cat D1 Exception Values:                      13,046,738                14,046,001
 Other Exception Values:                        2,045,477                 2,005,341
Exception Totals(3):                           28,507,410                30,402,139
Test Values(4):                               210,526,826               226,895,464

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     11,344,773
Confidence Interval Values:
  Local Test Value:                                       210,526,826  (Outside of ConfidenceInterval Limits)
  State Lower Limit:                                      215,550,691  (State Test Value Minus Margin of Error Value)
  State Upper Limit:                                      238,240,237  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       192,783,570  (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.