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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:13:28                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              101/Harris                                                VRSN:      W
                                                        101-921/Tomball ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              499,023,318        0.9835           507,395,341              62            4,199         .014337610
      2           A              497,675,192        0.9916           501,891,077              62            2,790         .003859571
      3           A              498,390,676        0.9982           499,289,397              61            2,192         .003921914
      4           A              497,689,909        0.9489           524,491,421              57            1,317         .012705155
      5           F1             138,179,248        0.9167           150,735,517               8              305         .013957935
      6           F1             139,700,693        0.9365           149,173,191               6               80         .020947308
      7           F1             141,889,988        1.0106           140,401,730               7               27         .002570775
      8           L1              46,206,635        0.9548            48,394,046               7              822         .041374185
      9           L1              46,549,780        0.8825            52,747,626               7              160         .023299653
     10           L1              48,669,812        0.8965            54,288,692               6               40         .015202693
     11           L1              43,335,027        0.9789            44,269,105               3                6         .002257753
  RANDOM TOTALS:               2,597,310,278                       2,673,077,143             286           11,938
  CATG D1 EXCEPTION VALUES:       13,447,756                          13,264,522
  CATG F1 EXCEPTION VALUES:       80,349,917                          86,706,848
 TOTAL TEST VALUES (4):        2,691,107,951                       2,773,048,513
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          138,652,426
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          2,634,396,087 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           2,691,107,951 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          2,911,700,939 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           3,287,342,635 (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