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2009 Confidence Interval Detail
228/Trinity
228-901/Groveton ISD

Category Summary

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

Stratum
Variance
A 12,382,405 0.5596 22,127,243 15 697 .294100441
A 12,723,556 0.7393 17,210,275 17 388 .069476950
A 13,473,663 0.6956 19,369,843 17 268 .082624520
A 14,045,930 0.7477 18,785,516 16 140 .066412497
C 4,404,309 0.8695 5,065,335 20 1,357 .114457286
C 4,170,637 0.9809 4,251,847 22 878 .046080666
C 2,038,217 0.7790 2,616,453 17 353 .150282588
C 3,499,259 0.8201 4,266,869 20 245 .387625256
D3 41,112,655 0.8496 48,390,601 21 4,090 .132867625
Random Totals: 107,850,631   142,083,982 165 8,416  
Catg J Exception Values: 5,200,770   5,338,675      
Catg D1 Exception Values: 36,031,305   34,905,646      
Total Test Values (4): 149,082,706   182,328,303      

Margin of Error

Margin of Error Percent: 5.7748478
Margin of Error Value: 10,529,182

Confidence Interval Values (5)

Local Test Value: 149,082,706 (Outside Confidence Interval)
State Lower Limit: 171,799,121 (State Test Value minus Margin of Error Percent)
State Upper Limit: 192,857,485 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 226,825,561 (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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