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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     13:39                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        057-907-057 Duncanville

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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        420,926,182     .9502     442,986,931       50
  2      A  - Single-family Residences        420,926,182    1.0114     416,181,711       50
  3      A  - Single-family Residences        420,571,867    1.0073     417,523,942       50
  4      A  - Single-family Residences        420,749,025    1.0169     413,756,539       50
  5      B  - Multi-family Residences          35,645,424    1.0063      35,422,264        8
  6      B  - Multi-family Residences          35,688,457     .9559      37,334,927        4
  7      B  - Multi-family Residences          35,760,178     .9792      36,519,790        4
  8      F  - Commercial Real                 108,139,041     .9871     109,552,265        7
  9      F  - Commercial Real                 107,322,897     .9406     114,100,465        6
 10      F  - Commercial Real                 107,912,334    1.0204     105,754,933        7
 11      F  - Commercial Real                 107,458,921     .9499     113,126,562        6
 12      L  - Commercial Personal              55,953,395    1.0054      55,652,870        8
 13      L  - Commercial Personal              56,283,364    1.0825      51,993,870        7
 14      L  - Commercial Personal              61,067,922    1.0073      60,625,357        6
 15      L  - Commercial Personal              50,626,745    1.0011      50,571,117        3

Random Totals:                              2,445,031,934             2,461,103,543      266
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                         158,494                   153,350
 Other Exception Values:                       29,525,480                29,109,000
Exception Totals(3):                           29,683,974                29,262,350
Test Values(4):                             2,474,715,908             2,490,365,893

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                    124,518,295
Confidence Interval Values:
  State Lower Limit:                                    2,365,847,598  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     2,474,715,908  (Within Confidence Interval Limits)
  State Upper Limit:                                    2,614,884,188  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     2,673,261,406  (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.