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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:41:28                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              043/Collin                                                VRSN:      W
                                                        043-917/Blue Ridge ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A                9,954,631        1.0390             9,580,973               9              225         .010533720
      2           A                9,843,754        0.9215            10,682,316               7              139         .025204548
      3           A                9,953,865        1.0385             9,584,848               6              106         .004286540
      4           A                9,836,722        0.9776            10,062,113              10               72         .006675491
      5           D3              48,211,972        0.9044            53,308,240              22            2,179         .059662325
  RANDOM TOTALS:                  87,800,944                          93,218,490              54            2,721
  CATG J  EXCEPTION VALUES:        7,116,355                           7,346,978
  CATG D1 EXCEPTION VALUES:        4,251,107                           3,720,427
 TOTAL TEST VALUES (4):           99,168,406                         104,285,895
 MARGIN OF ERROR PERCENT:          5.5334233
 MARGIN OF ERROR VALUE:            5,770,580
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:             98,515,315 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:              99,168,406 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            110,056,475 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):              96,498,831 (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