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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
                                                        020-901-020 Alvin

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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        282,342,259     .9101     310,232,127       47
  2      A  - Single-family Residences        282,223,428     .9569     294,935,132       45
  3      A  - Single-family Residences        281,985,766     .9533     295,799,608       49
  4      A  - Single-family Residences        282,223,428     .9708     290,712,225       49
  5      D  - Rural Real                      118,908,480     .7847     151,533,682       12
  6      F  - Commercial Real                  41,307,648     .9213      44,836,262        7
  7      F  - Commercial Real                  41,516,009     .8955      46,360,702        7
  8      F  - Commercial Real                  41,186,103     .8671      47,498,677        8
  9      F  - Commercial Real                  40,943,015     .8139      50,304,724        5
 10      L  - Commercial Personal              30,633,740    1.0351      29,594,957        7
 11      L  - Commercial Personal              30,981,704    1.0276      30,149,576        7
 12      L  - Commercial Personal              31,291,005    1.0042      31,160,132        7
 13      L  - Commercial Personal              29,538,297    1.0062      29,356,288        4

Random Totals:                              1,535,080,882             1,652,474,092      254
 Cat J Exception Values:                       69,863,937                71,220,195
 Cat D1 Exception Values:                      13,659,850                13,073,516
 Other Exception Values:                                0                         0
Exception Totals(3):                           83,523,787                84,293,711
Test Values(4):                             1,618,604,669             1,736,767,803

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     86,838,390
Confidence Interval Values:
  Local Test Value:                                     1,618,604,669  (Outside of ConfidenceInterval Limits)
  State Lower Limit:                                    1,649,929,413  (State Test Value Minus Margin of Error Value)
  State Upper Limit:                                    1,823,606,193  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     1,694,582,843  (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.