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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:06:47                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              070/Ellis                                                 VRSN:      W
                                                        070-905/Ferris ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               42,037,293        1.0245            41,032,009              16              889         .027944787
      2           A               41,932,564        0.9099            46,084,805              17              431         .058130758
      3           A               41,984,513        0.9837            42,680,200              14              280         .003241697
      4           A               41,984,615        1.0940            38,377,162              13              191         .013767945
      5           D3              36,884,260        0.9699            38,028,931              25            1,599         .070942821
      6           F1               4,355,464        0.6862             6,347,222              12               44         .649079408
      7           F1               4,213,014        0.9807             4,295,925               7               17         .050639387
      8           F1               4,494,065        0.8142             5,519,608               4               10         .032945643
  RANDOM TOTALS:                 217,885,788                         222,365,862             108            3,461
  CATG D1 EXCEPTION VALUES:        5,004,609                           6,004,255
  CATG F1 EXCEPTION VALUES:        2,401,370                           2,690,915
 TOTAL TEST VALUES (4):          225,291,767                         231,061,032
 MARGIN OF ERROR PERCENT:          5.0000002
 MARGIN OF ERROR VALUE:           11,553,052
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            219,507,980 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             225,291,767 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            242,614,084 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             260,131,138 (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