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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     17:19                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        026-902-026 Somerville

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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         10,854,756    1.0434      10,403,255       21
  2      A  - Single-family Residences         10,845,619     .9674      11,211,101       16
  3      A  - Single-family Residences         10,854,756     .9443      11,495,029       15
  4      A  - Single-family Residences         10,836,482    1.0728      10,101,120       15
  5      C  - Vacant Lots                       2,475,913    1.3880       1,783,799       19
  6      C  - Vacant Lots                       3,523,858    1.1997       2,937,283       18
  7      C  - Vacant Lots                       1,424,828    1.0054       1,417,175       13
  8      C  - Vacant Lots                       2,463,351    1.0911       2,257,677       14
  9      D  - Rural Real                       28,923,189    1.0638      27,188,559       21
 10      G  - Oil, Gas, Minerals               11,376,860     .9646      11,794,381       29

Random Totals:                                 93,579,612                90,589,379      181
 Cat J Exception Values:                        8,513,948                 8,885,195
 Cat D1 Exception Values:                       2,991,790                 2,803,444
 Other Exception Values:                                0                         0
Exception Totals(3):                           11,505,738                11,688,639
Test Values(4):                               105,085,350               102,278,018

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                      5,113,901
Confidence Interval Values:
  State Lower Limit:                                       97,164,117  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       105,085,350  (Within Confidence Interval Limits)
  State Upper Limit:                                      107,391,919  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       129,841,586  (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.