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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     20:49                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        199-901-199 Rockwall

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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        620,987,597    1.0067     616,854,671      104
  2      A  - Single-family Residences        620,464,880    1.0187     609,075,174      108
  3      A  - Single-family Residences        620,726,239    1.0184     609,511,232      106
  4      A  - Single-family Residences        620,726,239    1.0030     618,869,630      107
  5      D  - Rural Real                      181,091,130     .9652     187,620,317       11
  6      F  - Commercial Real                  92,441,672    1.0674      86,604,527        9
  7      F  - Commercial Real                  93,218,819    1.0165      91,705,675        9
  8      F  - Commercial Real                  95,783,405    1.0138      94,479,587        7
  9      F  - Commercial Real                  87,778,788     .9947      88,246,494        4

Random Totals:                              3,033,218,769             3,002,967,307      465
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       3,221,870                 2,558,675
 Other Exception Values:                                0                         0
Exception Totals(3):                            3,221,870                 2,558,675
Test Values(4):                             3,036,440,639             3,005,525,982

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                    150,276,299
Confidence Interval Values:
  State Lower Limit:                                    2,855,249,683  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     3,036,440,639  (Within Confidence Interval Limits)
  State Upper Limit:                                    3,155,802,281  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     3,390,944,530  (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.