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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     14:04                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        080-901-080 Mount Vernon

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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         74,547,222     .9911      75,216,650       46
  2      A  - Single-family Residences         74,609,999     .9914      75,257,211       26
  3      A  - Single-family Residences         74,704,164     .9649      77,421,664       19
  4      A  - Single-family Residences         74,358,892    1.0150      73,259,992        9
  5      D  - Rural Real                       81,299,200     .9819      82,797,841       32
  6      G  - Oil, Gas, Minerals                7,901,046    1.1040       7,156,745       11

Random Totals:                                387,420,523               391,110,103      143
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                      15,117,700                12,924,365
 Other Exception Values:                       24,331,404                24,709,182
Exception Totals(3):                           39,449,104                37,633,547
Test Values(4):                               426,869,627               428,743,650

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     21,437,183
Confidence Interval Values:
  State Lower Limit:                                      407,306,467  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       426,869,627  (Within Confidence Interval Limits)
  State Upper Limit:                                      450,180,833  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       550,127,672  (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.