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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:40:26                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              039/Clay                                                  VRSN:      W
                                                        039-903/Petrolia ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A                8,378,255        1.0135             8,266,655               9              260         .001457712
      2           A                8,358,526        0.9348             8,941,513               8              140         .010545511
      3           A                8,412,195        0.9178             9,165,608               7               96         .017315617
      4           A                8,256,204        1.0008             8,249,604               9               58         .006846399
      5           D3              16,344,330        0.9650            16,937,130              14            1,230         .003362671
  RANDOM TOTALS:                  49,749,510                          51,560,510              47            1,784
  CATG J  EXCEPTION VALUES:        4,482,860                           4,152,629
  CATG D1 EXCEPTION VALUES:        8,495,840                           7,583,048
 TOTAL TEST VALUES (4):           62,728,210                          63,296,187
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:            3,164,809
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:             60,131,378 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:              62,728,210 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:             66,460,996 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):              65,097,676 (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