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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     13:24                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        043-910-043 Plano

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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      4,222,180,941     .9954   4,241,692,728      107
  2      A  - Single-family Residences      4,222,180,941     .9929   4,252,372,788      107
  3      A  - Single-family Residences      4,222,180,941     .9958   4,239,988,894      106
  4      A  - Single-family Residences      4,222,180,941    1.0155   4,157,736,032      107
  5      B  - Multi-family Residences         514,503,687     .8999     571,734,289        7
  6      B  - Multi-family Residences         503,221,645     .9606     523,861,800        6
  7      B  - Multi-family Residences         514,077,950     .9227     557,145,280        6
  8      B  - Multi-family Residences         490,236,653     .9816     499,426,093        6
  9      C  - Vacant Lots                      74,372,441    1.0145      73,309,454       31
 10      C  - Vacant Lots                      74,498,017     .9693      76,857,544       11
 11      C  - Vacant Lots                      75,314,261     .9876      76,259,884        7
 12      C  - Vacant Lots                      72,928,316     .9480      76,928,603        6
 13      D  - Rural Real                      297,999,563    1.0138     293,943,148       14
 14      F  - Commercial Real               1,297,617,884     .9260   1,401,315,210       15
 15      F  - Commercial Real               1,314,555,212     .9495   1,384,470,997        7
 16      F  - Commercial Real               1,282,319,652     .9877   1,298,288,602        7
 17      F  - Commercial Real               1,297,071,518    1.0186   1,273,386,529        6
 18      L  - Commercial Personal             488,413,146     .8789     555,709,576        8
 19      L  - Commercial Personal             486,770,731     .9092     535,383,558        9
 20      L  - Commercial Personal             492,313,882     .9936     495,484,986        8
 21      L  - Commercial Personal             482,869,996     .9241     522,530,025        4

Random Totals:                             26,647,808,318            27,107,826,020      585
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       2,079,154                 1,848,174
 Other Exception Values:                                0                         0
Exception Totals(3):                            2,079,154                 1,848,174
Test Values(4):                            26,649,887,472            27,109,674,194

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                  1,355,483,710
Confidence Interval Values:
  State Lower Limit:                                   25,754,190,484  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                    26,649,887,472  (Within Confidence Interval Limits)
  State Upper Limit:                                   28,465,157,904  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                    27,594,319,479  (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.