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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     12:59                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        020-907-020 Columbia-Brazoria

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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         97,400,080    1.0171      95,762,541       16
  2      A  - Single-family Residences         97,441,091    1.0094      96,533,674       23
  3      A  - Single-family Residences         97,441,091     .9655     100,922,932       38
  4      A  - Single-family Residences         97,318,059     .9662     100,722,479       19
  5      D  - Rural Real                       38,192,730     .8650      44,153,445       11
  6      F  - Commercial Real                   8,880,442     .9211       9,641,127        8
  7      F  - Commercial Real                   8,962,877     .9008       9,949,908        7
  8      F  - Commercial Real                   8,977,865     .8854      10,139,897        7
  9      F  - Commercial Real                   8,779,273     .9440       9,300,077        4

Random Totals:                                463,393,508               477,126,080      133
 Cat J Exception Values:                       33,622,212                34,631,988
 Cat D1 Exception Values:                       9,025,250                 9,239,588
 Other Exception Values:                                0                         0
Exception Totals(3):                           42,647,462                43,871,576
Test Values(4):                               506,040,970               520,997,656

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     26,049,883
Confidence Interval Values:
  State Lower Limit:                                      494,947,773  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       506,040,970  (Within Confidence Interval Limits)
  State Upper Limit:                                      547,047,539  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       535,511,565  (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.