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2009 Confidence Interval Detail
228/Trinity
228-903/Trinity ISD

Category Summary

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

Stratum
Variance
A 37,678,479 0.7032 53,581,455 15 1,580 .366783923
A 38,348,452 0.7227 53,062,754 22 725 .087164377
A 38,408,366 0.7733 49,668,131 15 407 .012493302
A 40,510,051 0.8302 48,795,532 17 232 .035260920
C 9,249,092 1.1060 8,362,651 18 3,336 .099641969
C 8,749,603 0.7356 11,894,512 24 2,051 .744389160
C 10,194,895 0.9157 11,133,444 17 1,038 .188022779
C 7,321,381 0.9453 7,745,034 16 262 .020748229
D3 28,761,945 1.0362 27,757,137 22 1,712 .012157056
F1 4,542,060 0.6418 7,077,065 16 113 .664088218
F1 3,737,825 0.8960 4,171,680 14 34 .052929396
F1 5,512,991 0.8560 6,440,410 9 17 .068779493
F1 4,233,722 0.8951 4,729,887 5 6 .009461986
L1 3,458,226 1.0016 3,452,702 15 88 .003715159
L1 6,739,615 1.0145 6,643,287 12 15 .003429097
Random Totals: 247,446,703   304,515,681 237 11,616  
Catg J Exception Values: 8,993,370   9,208,768      
Catg D1 Exception Values: 8,274,290   7,797,253      
Total Test Values (4): 264,714,363   321,521,702      

Margin of Error

Margin of Error Percent: 5.9561385
Margin of Error Value: 19,150,278

Confidence Interval Values (5)

Local Test Value: 264,714,363 (Outside Confidence Interval)
State Lower Limit: 302,371,424 (State Test Value minus Margin of Error Percent)
State Upper Limit: 340,671,980 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 275,481,170 (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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