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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:10:30                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              091/Grayson                                               VRSN:      W
                                                        091-902/Collinsville ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               14,212,011        0.9680            14,681,830              11              283         .019767738
      2           A               14,173,664        1.0302            13,758,167              11              180         .008868912
      3           A               14,129,965        1.0161            13,906,077              14              132         .005257251
      4           A               14,114,538        0.9934            14,208,313              11               79         .007397209
      5           D3              26,284,219        1.0244            25,658,160              27            1,169         .081344889
  RANDOM TOTALS:                  82,914,397                          82,212,547              74            1,843
  CATG D1 EXCEPTION VALUES:        4,179,372                           2,941,985
 TOTAL TEST VALUES (4):           87,093,769                          85,154,532
 MARGIN OF ERROR PERCENT:          5.0000005
 MARGIN OF ERROR VALUE:            4,257,727
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:             80,896,805 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:              87,093,769 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:             89,412,259 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):              95,889,708 (SEE ISD SUMMARY WORKSHEET)

 SOURCES:
 (1) SEE STRATIFIED CATEGORY WORKSHEET REPORTS PTS236, PTS430
 (2) NUMBER OF PARCELS SAMPLED BY STAFF
 (3) TOTAL CATEGORY PARCELS FROM STRATIFICATION REPORT APPRAISAL ROLL, OR SELF-REPORT
 (4) INCLUDES ANY PARCELS IN A, B, C, D3, F1, G1, G2,OR L1 MARKED AS EXCEPTION PROPERTIES
 (5) UNSTUDIED CATEGORIES AND SUB-CATEGORIES WERE NOT INCLUDED IN THE CONFIDENCE INTERVAL VALUES