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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     17:17                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        246-909-246 Round Rock

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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      1,944,170,301     .9539   2,038,128,002       48
  2      A  - Single-family Residences      1,944,170,301     .9538   2,038,341,687       50
  3      A  - Single-family Residences      1,945,807,497     .9414   2,066,929,570       50
  4      A  - Single-family Residences      1,942,533,105     .9534   2,037,479,657       48
  5      B  - Multi-family Residences         285,973,865     .9394     304,421,828       13
  6      B  - Multi-family Residences         286,211,780     .9306     307,556,179        5
  7      B  - Multi-family Residences         284,665,332     .9225     308,580,306        5
  8      B  - Multi-family Residences         273,364,369     .9526     286,966,585        5
  9      C  - Vacant Lots                     120,424,444    1.0096     119,279,362       11
 10      C  - Vacant Lots                     120,322,303    1.0021     120,070,156       11
 11      C  - Vacant Lots                     121,854,421    1.0169     119,829,306       11
 12      C  - Vacant Lots                     118,432,691    1.0269     115,330,306        7
 13      F  - Commercial Real                 530,223,825     .9173     578,026,627       11
 14      F  - Commercial Real                 536,477,518     .9653     555,762,476        8
 15      F  - Commercial Real                 535,360,787     .9412     568,806,616        8
 16      F  - Commercial Real                 519,949,901     .9984     520,783,154        5
 17      L  - Commercial Personal             192,808,961    1.0341     186,450,982        9
 18      L  - Commercial Personal             194,349,486     .9327     208,372,988        7
 19      L  - Commercial Personal             196,700,815    1.0294     191,082,976        8
 20      L  - Commercial Personal             186,322,536     .9637     193,340,807        5

Random Totals:                             12,280,124,238            12,865,539,570      325
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       1,805,162                 1,891,500
 Other Exception Values:                                0                         0
Exception Totals(3):                            1,805,162                 1,891,500
Test Values(4):                            12,281,929,400            12,867,431,070

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                    643,371,554
Confidence Interval Values:
  State Lower Limit:                                   12,224,059,516  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                    12,281,929,400  (Within Confidence Interval Limits)
  State Upper Limit:                                   13,510,802,624  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                    13,297,820,055  (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.