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2008 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 1,165,408 0.6403 1,820,097 12 53 .145937277
A 1,038,819 0.5214 1,992,365 9 28 .034751846
A 1,208,778 0.5217 2,316,998 8 20 .023748210
A 1,221,103 0.5898 2,070,368 6 11 .017672530
D3 8,781,506 0.8594 10,218,182 23 1,216 .027124657
G1 2,498,021 0.7343 3,401,908 6 7 .121068229
Random Totals: 15,913,635   21,819,918 64 1,335  
Catg D1 Exception Values: 8,097,792   11,663,630      
Catg G1 Exception Values: 4,640,185   3,834,739      
Total Test Values (4): 28,651,612   37,318,287      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 1,865,914

Confidence Interval Values (5)

Local Test Value: 28,651,612 (Outside Confidence Interval)
State Lower Limit: 35,452,373 (State Test Value minus Margin of Error Percent)
State Upper Limit: 39,184,201 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 26,146,259 (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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