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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:58                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        011-902-011 Elgin

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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         79,951,315     .9667      82,705,405       22
  2      A  - Single-family Residences         79,884,044     .9417      84,829,610       44
  3      A  - Single-family Residences         79,917,680    1.0044      79,567,583       48
  4      A  - Single-family Residences         79,816,773     .9562      83,472,885       25
  5      D  - Rural Real                      138,692,988    1.0323     134,353,374       40
  6      F  - Commercial Real                  11,127,182     .9219      12,069,836        8
  7      F  - Commercial Real                  11,178,827     .9753      11,461,937        7
  8      F  - Commercial Real                  11,756,314     .9885      11,893,084        5

Random Totals:                                492,325,123               500,353,714      199
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       8,107,304                 9,966,580
 Other Exception Values:                       10,459,876                10,965,918
Exception Totals(3):                           18,567,180                20,932,498
Test Values(4):                               510,892,303               521,286,212

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     26,064,311
Confidence Interval Values:
  State Lower Limit:                                      495,221,901  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       510,892,303  (Within Confidence Interval Limits)
  State Upper Limit:                                      547,350,523  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       583,967,846  (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.