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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:29                                      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        621,380,419    1.0067     617,244,878      104
  2      A  - Single-family Residences        620,857,371    1.0187     609,460,460      108
  3      A  - Single-family Residences        621,118,895    1.0184     609,896,794      106
  4      A  - Single-family Residences        621,118,895    1.0030     619,261,112      107
  5      D  - Rural Real                      184,459,880     .9652     191,110,526       11
  6      F  - Commercial Real                  92,542,789    1.0674      86,699,259        9
  7      F  - Commercial Real                  93,320,786    1.0165      91,805,987        9
  8      F  - Commercial Real                  95,888,178    1.0138      94,582,934        7
  9      F  - Commercial Real                  87,874,805     .9947      88,343,023        4

Random Totals:                              3,038,562,018             3,008,404,973      465
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       3,218,320                 2,756,907
 Other Exception Values:                                0                         0
Exception Totals(3):                            3,218,320                 2,756,907
Test Values(4):                             3,041,780,338             3,011,161,880

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                    150,558,094
Confidence Interval Values:
  State Lower Limit:                                    2,860,603,786  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     3,041,780,338  (Within Confidence Interval Limits)
  State Upper Limit:                                    3,161,719,974  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     3,399,081,527  (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.