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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     19:34                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        126-907-126 Rio Vista

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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         46,639,300     .9207      50,656,348       23
  2      D  - Rural Real                       41,560,440    1.0771      38,585,498       21

Random Totals:                                 88,199,740                89,241,846       44
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       5,107,210                 4,971,266
 Other Exception Values:                                0                         0
Exception Totals(3):                            5,107,210                 4,971,266
Test Values(4):                                93,306,950                94,213,112

Margin of Error Percent:                                    7.3249093
Margin of Error Value:                                      6,901,025
Confidence Interval Values:
  State Lower Limit:                                       87,312,087  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                        93,306,950  (Within Confidence Interval Limits)
  State Upper Limit:                                      101,114,137  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                        94,101,742  (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.