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2007 Confidence Interval Detail
101/Harris
101-921/Tomball ISD

Category Summary

(1)
Category
(1)
Local
Value
(1)
Stratum
Ratio
(1)
State
Value
(2)
Sample
Size
(3)
Total
Parcels

Stratum
Variance
A 606,700,617 0.9876 614,318,162 66 4,534 .003937999
A 607,424,669 0.9976 608,885,995 74 3,166 .004056559
A 606,015,948 0.9804 618,131,322 79 2,445 .004035363
A 606,336,935 0.9763 621,055,961 56 1,480 .004484305
C 39,712,328 0.8001 49,634,206 7 2,036 .094706386
C 39,754,068 0.9565 41,562,016 8 1,051 .019978003
C 39,787,187 0.6038 65,894,646 14 388 .489359443
C 39,550,822 0.7327 53,979,558 11 98 .124364455
F1 202,342,986 0.8563 236,299,178 9 333 .051361461
F1 209,678,040 0.9572 219,053,531 9 78 .002230509
F1 393,580,922 0.9997 393,699,032 7 21 .001396064
L1 49,794,227 0.7095 70,182,138 8 782 .555711094
L1 50,405,881 0.9815 51,355,966 8 149 .003057941
L1 53,535,488 0.9526 56,199,337 7 37 .030748223
L1 48,331,396 0.9536 50,683,091 4 8 .004279219
Random Totals: 3,592,951,514   3,750,934,139 367 16,606  
Catg D1 Exception Values: 9,538,988   9,307,357      
Total Test Values (4): 3,602,490,502   3,760,241,496      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 188,012,075

Confidence Interval Values (5)

State Lower Limit: 3,572,229,421 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,602,490,502 (Within Confidence Interval)
State Upper Limit: 3,948,253,571 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,147,331,659 (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
(6) Includes local value of unstudied property categories and sub-categories

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