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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
                                                        057-912-057 Irving

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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        824,323,096     .9195     896,490,588       75
  2      A  - Single-family Residences        824,323,096     .9888     833,660,089       75
  3      A  - Single-family Residences        824,323,096    1.0023     822,431,504       75
  4      A  - Single-family Residences        824,323,096    1.0156     811,661,182       75
  5      B  - Multi-family Residences         218,853,375     .8368     261,536,060       11
  6      B  - Multi-family Residences         218,578,894     .9944     219,809,829        6
  7      B  - Multi-family Residences         216,200,053    1.0005     216,092,007        7
  8      B  - Multi-family Residences         215,468,102    1.0074     213,885,350        6
  9      F  - Commercial Real                 563,019,304    1.0079     558,606,314        8
 10      F  - Commercial Real                 563,728,099     .9377     601,181,720        7
 11      F  - Commercial Real                 573,651,226     .9428     608,454,843        6
 12      F  - Commercial Real                 544,118,111     .9865     551,564,228        6
 13      L  - Commercial Personal             234,434,070    1.0348     226,550,126        8
 14      L  - Commercial Personal             234,927,615     .9656     243,297,033        6
 15      L  - Commercial Personal             236,408,251    1.0271     230,170,627        8
 16      L  - Commercial Personal             232,065,052     .9939     233,489,337        5

Random Totals:                              7,348,744,536             7,528,880,837      384
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                         127,507                    98,326
 Other Exception Values:                                0                         0
Exception Totals(3):                              127,507                    98,326
Test Values(4):                             7,348,872,043             7,528,979,163

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                    376,448,958
Confidence Interval Values:
  State Lower Limit:                                    7,152,530,205  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     7,348,872,043  (Within Confidence Interval Limits)
  State Upper Limit:                                    7,905,428,121  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     7,646,333,830  (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.