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2009 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 29,092,540 1.0058 28,924,776 16 798 .017434705
A 27,651,836 1.0255 26,964,248 16 388 .008675259
A 28,155,050 0.9520 29,574,632 16 270 .016142162
A 30,580,250 1.0318 29,637,769 16 178 .020270561
D3 14,158,015 0.9883 14,325,625 28 1,080 .010976758
Random Totals: 129,637,691   129,427,050 92 2,714  
Catg D1 Exception Values: 5,975,230   6,041,037      
Total Test Values (4): 135,612,921   135,468,087      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 6,773,404

Confidence Interval Values (5)

State Lower Limit: 128,694,683 (State Test Value minus Margin of Error Percent)
Local Test Value: 135,612,921 (Within Confidence Interval)
State Upper Limit: 142,241,491 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 128,770,984 (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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