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Date:   1/22/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     15:42                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        152-906-152 Lubbock-Cooper

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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         81,961,729     .9219      88,905,227       64
  2      A  - Single-family Residences         81,996,239     .9406      87,174,398       64
  3      A  - Single-family Residences         81,961,729     .9686      84,618,758       64
  4      A  - Single-family Residences         81,927,219     .9642      84,969,113       53
  5      D  - Rural Real                       32,698,111     .9613      34,014,471       12
  6      F  - Commercial Real                   9,593,037    1.0135       9,465,256        7
  7      F  - Commercial Real                   9,448,841     .9684       9,757,167        7
  8      F  - Commercial Real                  10,257,940     .9105      11,266,271        6
  9      F  - Commercial Real                   8,779,932    1.0472       8,384,198        3
 10      L  - Commercial Personal               5,187,335    1.0047       5,163,069        7
 11      L  - Commercial Personal               5,147,845    1.0324       4,986,289        6
 12      L  - Commercial Personal               5,218,363    1.0494       4,972,711        5
 13      L  - Commercial Personal              11,246,278    1.0026      11,217,114        4

Random Totals:                                425,424,598               444,894,042      302
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                       9,769,828                 6,952,870
 Other Exception Values:                                0                         0
Exception Totals(3):                            9,769,828                 6,952,870
Test Values(4):                               435,194,426               451,846,912

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     22,592,346
Confidence Interval Values:
  State Lower Limit:                                      429,254,566  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                       435,194,426  (Within Confidence Interval Limits)
  State Upper Limit:                                      474,439,258  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                       476,016,390  (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.