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2009 Confidence Interval Detail
091/Grayson
091-905/Howe ISD

Category Summary

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

Stratum
Variance
A 28,246,489 0.9846 28,688,289 8 406 .002203463
A 30,689,614 1.0630 28,870,756 8 293 .014837575
A 29,349,502 0.9411 31,186,380 8 215 .003042411
A 30,589,452 0.9999 30,592,511 10 158 .000910195
D3 44,892,506 0.8344 53,802,140 20 1,331 .057466827
F1 3,629,998 0.9017 4,025,727 7 30 .012556705
F1 3,132,149 0.8832 3,546,364 5 9 .056488630
F1 3,899,378 0.9970 3,911,111 3 7 .000090862
Random Totals: 174,429,088   184,623,278 69 2,449  
Catg D1 Exception Values: 5,998,332   4,962,638      
Catg F1 Exception Values: 3,093,266   3,426,116      
Total Test Values (4): 183,520,686   193,012,032      

Margin of Error

Margin of Error Percent: 5.0000002
Margin of Error Value: 9,650,602

Confidence Interval Values (5)

State Lower Limit: 183,361,430 (State Test Value minus Margin of Error Percent)
Local Test Value: 183,520,686 (Within Confidence Interval)
State Upper Limit: 202,662,634 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 186,225,880 (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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