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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     17:41                                      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      4,222,370,853     .9954   4,241,883,517      107
  2      A  - Single-family Residences      4,222,370,853     .9929   4,252,564,058      107
  3      A  - Single-family Residences      4,222,370,853     .9958   4,240,179,607      106
  4      A  - Single-family Residences      4,222,370,853    1.0155   4,157,923,046      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                      74,653,764    1.0145      73,586,756       31
 10      C  - Vacant Lots                      74,779,815     .9693      77,148,267       11
 11      C  - Vacant Lots                      75,599,147     .9876      76,548,346        7
 12      C  - Vacant Lots                      73,204,176     .9480      77,219,595        6
 13      D  - Rural Real                      301,195,724    1.0138     297,095,802       14
 14      F  - Commercial Real               1,297,210,939     .9260   1,400,875,744       15
 15      F  - Commercial Real               1,314,142,956     .9495   1,384,036,815        7
 16      F  - Commercial Real               1,281,917,505     .9877   1,297,881,447        7
 17      F  - Commercial Real               1,296,664,745    1.0186   1,272,987,183        6
 18      L  - Commercial Personal             434,225,797     .8789     494,055,976        8
 19      L  - Commercial Personal             432,765,601     .9092     475,985,043        9
 20      L  - Commercial Personal             437,693,763     .9936     440,513,046        8
 21      L  - Commercial Personal             429,297,636     .9241     464,557,554        4

Random Totals:                             26,434,874,915            26,877,209,264      585
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       2,067,063                 1,838,200
 Other Exception Values:                                0                         0
Exception Totals(3):                            2,067,063                 1,838,200
Test Values(4):                            26,436,941,978            26,879,047,464

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                  1,343,952,373
Confidence Interval Values:
  State Lower Limit:                                   25,535,095,091  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                    26,436,941,978  (Within Confidence Interval Limits)
  State Upper Limit:                                   28,222,999,837  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                    27,393,034,672  (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.