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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     16:43                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        218-901-218 Sonora

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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         12,899,154     .9393      13,732,731        7
  2      A  - Single-family Residences         12,899,154     .9110      14,159,335        8
  3      A  - Single-family Residences         12,899,154     .9697      13,302,211        8
  4      A  - Single-family Residences         12,893,725     .9077      14,204,831        7
  5      D  - Rural Real                       17,277,126     .9481      18,222,894       16
  6      G  - Oil, Gas, Minerals              330,158,190     .9994     330,356,404       15

Random Totals:                                399,026,503               403,978,406       61
 Cat J Exception Values:                       14,037,476                15,320,212
 Cat D1 Exception Values:                      33,451,946                40,330,194
 Other Exception Values:                                0                         0
Exception Totals(3):                           47,489,422                55,650,406
Test Values(4):                               446,515,925               459,628,812

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     22,981,441
Confidence Interval Values:
  State Lower Limit:                                      436,647,371  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       446,515,925  (Within Confidence Interval Limits)
  State Upper Limit:                                      482,610,253  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       546,724,483  (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.