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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:46:28                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              070/Ellis                                                 VRSN:      W
                                                        070-911/Red Oak ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              192,053,974        0.9988           192,284,716              54            1,826         .007353107
      2           A              191,888,534        1.0022           191,467,306              57            1,402         .002688029
      3           A              191,931,719        1.0211           187,965,644              55            1,110         .014755717
      4           A              191,890,899        1.0205           188,036,158              55              703         .002453916
      5           F1              12,924,327        0.9518            13,578,826               8               90         .041109810
      6           F1              13,160,563        0.8743            15,052,686               9               34         .063918999
      7           F1              12,836,772        0.8043            15,960,179               8               14         .087976524
      8           F1              12,045,615        0.9508            12,668,926               4                5         .041351722
  RANDOM TOTALS:                 818,732,403                         817,014,441             250            5,184
  CATG D1 EXCEPTION VALUES:        1,523,850                           1,465,159
 TOTAL TEST VALUES (4):          820,256,253                         818,479,600
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:           40,923,980
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            777,555,620 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             820,256,253 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            859,403,580 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             901,988,672 (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