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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:41:18                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              043/Collin                                                VRSN:      W
                                                        043-910/Plano ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A            4,509,963,416        1.0111         4,460,452,394              80           28,384         .002114203
      2           A            4,509,784,445        1.0035         4,494,055,252              82           20,825         .001011464
      3           A            4,509,672,666        1.0053         4,485,897,410              81           14,847         .001092847
      4           A            4,509,610,899        1.0042         4,490,749,750              79            7,425         .002511135
      5           B              525,531,551        1.0006           525,216,421              15              221         .000124642
      6           B              531,133,847        1.0092           526,291,961               7               40         .027435844
      7           B              521,435,951        1.0373           502,685,772               6               28         .006733078
      8           B              508,064,848        0.9552           531,893,685               6               18         .025572826
      9           C               66,433,624        0.8792            75,561,447               8              941         .045185208
     10           C               66,204,314        0.9595            68,998,764               7              152         .003083701
     11           C               67,856,671        1.0195            66,558,775               7               60         .002885158
     12           C               64,704,123        0.9961            64,957,457               5               17         .000298095
     13           D3             282,658,240        0.9371           301,630,818              10              966         .026788566
     14           F1           1,414,474,632        0.8502         1,663,696,344              21              813         .091246679
     15           F1           1,410,297,779        0.7463         1,889,719,656              13              214         .591531455
     16           F1           1,452,368,287        0.9303         1,561,182,723              10               83         .033644817
     17           F1           1,364,059,370        0.8535         1,598,194,927               6               25         .022192380
     18           L1             453,831,645        0.9678           468,931,231               7            2,550         .007944849
     19           L1             454,146,465        0.9429           481,648,600               7              286         .012882342
     20           L1             455,539,999        0.9563           476,356,791               6               69         .004037318
     21           L1             449,443,867        0.9948           451,793,192               5               19         .002968115
  RANDOM TOTALS:              28,127,216,639                      29,186,473,370             468           77,983
  CATG D1 EXCEPTION VALUES:        1,875,696                           1,767,986
 TOTAL TEST VALUES (4):       28,129,092,335                      29,188,241,356
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:        1,459,412,068
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:         27,728,829,288 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:          28,129,092,335 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:         30,647,653,424 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):          28,921,415,823 (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