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2006 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 1,074,463 1.0255 1,047,745 7 54 .064864802
A 1,063,047 0.9601 1,107,225 7 31 .002314800
A 1,134,751 0.9867 1,150,047 8 20 .003704967
A 994,970 0.9585 1,038,049 6 10 .001370588
D3 7,516,023 0.8015 9,377,446 13 1,154 .341186811
Random Totals: 11,783,254   13,720,512 41 1,269  
Catg D1 Exception Values: 7,632,564   7,290,226      
Catg G1 Exception Values: 7,392,739   7,463,618      
Total Test Values (4): 26,808,557   28,474,356      

Margin of Error

Margin of Error Percent: 10.7659257
Margin of Error Value: 3,065,528

Confidence Interval Values (5)

State Lower Limit: 25,408,828 (State Test Value minus Margin of Error Percent)
Local Test Value: 26,808,557 (Within Confidence Interval)
State Upper Limit: 31,539,884 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 22,785,969 (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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