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2011 Confidence Interval Detail
228/Trinity
228-904/Centerville ISD

Category Summary

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

Stratum
Variance
A 763,427 0.9413 811,035 10 31 .018688379
A 1,218,560 1.0559 1,154,049 11 25 .002238465
A 1,607,888 1.0757 1,494,736 12 22 .006179031
D3 13,703,443 0.9257 14,803,330 19 1,207 .257955427
G1 486,044 0.9293 523,022 4 6 .053509832
Random Totals: 17,779,362   18,786,172 56 1,291  
Catg D1 Exception Values: 7,746,387   7,469,513      
Catg A Exception Values: 1,621,547   1,575,899      
Catg G1 Exception Values: 6,988,395   6,911,047      
Total Test Values (4): 34,135,691   34,742,631      

Margin of Error

Margin of Error Percent: 9.8807399
Margin of Error Value: 3,432,829

Confidence Interval Values (5)

State Lower Limit: 31,309,802 (State Test Value minus Margin of Error Percent)
Local Test Value: 34,135,691 (Within Confidence Interval)
State Upper Limit: 38,175,460 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 29,224,837 (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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