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2009 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 1,137,219 0.8191 1,388,376 14 51 .107646938
A 1,154,735 0.6962 1,658,625 15 30 .054245245
A 1,078,431 0.6982 1,544,588 12 17 .044059642
A 1,195,367 0.8805 1,357,600 7 11 .045819392
D3 9,600,721 0.8392 11,440,325 25 1,181 .139852863
G1 990,341 1.0032 987,182 5 6 .009723642
Random Totals: 15,156,814   18,376,696 78 1,296  
Catg D1 Exception Values: 9,383,004   9,126,965      
Catg G1 Exception Values: 3,051,502   2,981,346      
Total Test Values (4): 27,591,320   30,485,007      

Margin of Error

Margin of Error Percent: 5.6143041
Margin of Error Value: 1,711,521

Confidence Interval Values (5)

Local Test Value: 27,591,320 (Outside Confidence Interval)
State Lower Limit: 28,773,486 (State Test Value minus Margin of Error Percent)
State Upper Limit: 32,196,528 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 26,722,198 (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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