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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     19:19                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        114-901-114 Big Spring

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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         63,611,200     .9940      63,995,171       10
  2      A  - Single-family Residences         63,637,984     .9198      69,186,762       11
  3      A  - Single-family Residences         63,637,984     .9588      66,372,532       16
  4      A  - Single-family Residences         63,557,633     .9281      68,481,449       17
  5      F  - Commercial Real                  21,660,392     .8882      24,386,841       12
  6      F  - Commercial Real                  21,806,254     .8528      25,570,185        7
  7      F  - Commercial Real                  21,660,392     .9559      22,659,684        7
  8      F  - Commercial Real                  21,487,182    1.1188      19,205,561        3
  9      G  - Oil, Gas, Minerals               73,532,190    1.0028      73,326,875       12
 10      L  - Commercial Personal              14,074,225     .9670      14,554,524       11
 11      L  - Commercial Personal              14,062,403     .9243      15,214,111       11
 12      L  - Commercial Personal              17,165,708    1.0766      15,944,369        6

Random Totals:                                459,893,547               478,898,064      123
 Cat J Exception Values:                       27,656,075                28,322,257
 Cat D1 Exception Values:                       7,461,700                 7,747,310
 Other Exception Values:                        9,597,889                 9,516,016
Exception Totals(3):                           44,715,664                45,585,583
Test Values(4):                               504,609,211               524,483,647

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     26,224,182
Confidence Interval Values:
  State Lower Limit:                                      498,259,465  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       504,609,211  (Within Confidence Interval Limits)
  State Upper Limit:                                      550,707,829  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       655,319,707  (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.