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2008 Confidence Interval Detail
226/Tom Green
226-907/Grape Creek ISD

Category Summary

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

Stratum
Variance
A 16,247,615 0.8775 18,515,801 18 579 .107927501
A 13,400,825 1.0193 13,147,086 19 270 .017958682
A 23,434,286 1.0134 23,124,419 20 335 .017032201
A 57,856,800 1.0846 53,343,906 31 462 .025108437
D3 11,081,315 0.6704 16,529,408 37 1,083 .417362490
L1 1,478,101 0.9605 1,538,887 8 64 .070861967
L1 1,342,832 0.9958 1,348,496 5 15 .000294307
L1 443,936 1.0971 404,645 3 2 .054675485
Random Totals: 125,285,710   127,952,648 141 2,810  
Catg D1 Exception Values: 5,770,290   5,366,776      
Catg L1 Exception Values: 5,968,511   6,200,723      
Total Test Values (4): 137,024,511   139,520,147      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 6,976,007

Confidence Interval Values (5)

State Lower Limit: 132,544,140 (State Test Value minus Margin of Error Percent)
Local Test Value: 137,024,511 (Within Confidence Interval)
State Upper Limit: 146,496,154 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 117,362,751 (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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