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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     20:42                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        189-901-189 Marfa

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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          7,141,775     .9976       7,158,956        9
  2      A  - Single-family Residences          7,165,832     .7537       9,507,539        9
  3      A  - Single-family Residences          7,114,712    1.0863       6,549,491        8
  4      A  - Single-family Residences          7,147,789     .9856       7,252,221       10
  5      D  - Rural Real                        9,971,476    1.0782       9,248,262       15
  6      F  - Commercial Real                   2,354,016     .9802       2,401,567       10
  7      F  - Commercial Real                   2,370,916    1.0076       2,353,033       10
  8      L  - Commercial Personal                 687,991    1.0445         658,680        8
  9      L  - Commercial Personal                 738,175     .9927         743,603        8

Random Totals:                                 44,692,682                45,873,352       87
 Cat J Exception Values:                       13,367,905                13,958,418
 Cat D1 Exception Values:                      13,015,880                15,208,553
 Other Exception Values:                        5,430,765                 5,409,821
Exception Totals(3):                           31,814,550                34,576,792
Test Values(4):                                76,507,232                80,450,144

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      4,022,507
Confidence Interval Values:
  State Lower Limit:                                       76,427,637  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        76,507,232  (Within Confidence Interval Limits)
  State Upper Limit:                                       84,472,651  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        85,184,759  (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.