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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 0.6829 18,132,091 10 697 .376440736
A 12,723,556 0.7856 16,195,973 15 388 .079743426
A 13,473,663 0.7301 18,454,545 18 268 .092373595
A 14,045,930 0.7477 18,785,516 16 140 .066412497
C 4,404,309 0.9332 4,719,577 19 1,357 .021056973
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 0.9314 3,756,988 19 245 .127625662
D3 41,112,655 0.8809 46,671,194 20 4,090 .106025005
Random Totals: 107,850,631   133,584,184 156 8,416  
Catg J Exception Values: 5,200,770   5,169,765      
Catg D1 Exception Values: 36,031,305   34,905,646      
Total Test Values (4): 149,082,706   173,659,595      

Margin of Error

Margin of Error Percent: 5.9896437
Margin of Error Value: 10,401,591

Confidence Interval Values (5)

Local Test Value: 149,082,706 (Outside Confidence Interval)
State Lower Limit: 163,258,004 (State Test Value minus Margin of Error Percent)
State Upper Limit: 184,061,186 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 219,627,209 (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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