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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:41:23                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              043/Collin                                                VRSN:      W
                                                        043-912/Prosper ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              111,973,888        1.0067           111,228,656              59              702         .001870956
      2           A              111,836,485        1.0085           110,893,887              49              501         .001544706
      3           A              112,089,553        1.0087           111,122,785              41              320         .001693799
      4           A              111,374,326        0.9907           112,419,830              18              184         .001199547
      5           D3              84,237,213        0.8482            99,312,913              15            1,164         .076524172
      6           F1              16,539,235        0.8821            18,749,841               7              120         .020135432
      7           F1              16,225,512        0.8540            18,999,429               6               35         .068564898
      8           F1              17,327,043        0.9951            17,412,364               4               12         .001377464
      9           F1              15,352,133        1.0137            15,144,651               3                5         .000705196
     10           L1               6,722,370        0.8884             7,566,828               6               70         .021096014
     11           L1               7,375,147        0.9878             7,466,235               5               13         .001945595
     12           L1              12,076,531        0.9580            12,605,982               3                5         .004541099
  RANDOM TOTALS:                 623,129,436                         642,923,401             216            3,131
  CATG D1 EXCEPTION VALUES:        4,209,037                           3,812,631
 TOTAL TEST VALUES (4):          627,338,473                         646,736,032
 MARGIN OF ERROR PERCENT:          5.0000001
 MARGIN OF ERROR VALUE:           32,336,802
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            614,399,230 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             627,338,473 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            679,072,834 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             744,594,909 (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