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2009 Confidence Interval Detail
091/Grayson
091-918/Tom Bean ISD

Category Summary

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

Stratum
Variance
A 21,020,854 0.9403 22,355,476 14 361 .020709951
A 21,675,322 0.8918 24,305,138 14 226 .015285057
A 31,380,866 0.8561 36,655,608 14 236 .031542144
A 24,438,582 0.9596 25,467,468 13 124 .011272561
D3 46,049,272 0.9139 50,387,649 20 1,498 .241568643
Random Totals: 144,564,896   159,171,339 75 2,445  
Catg D1 Exception Values: 3,666,198   2,876,879      
Total Test Values (4): 148,231,094   162,048,218      

Margin of Error

Margin of Error Percent: 7.2573486
Margin of Error Value: 11,760,404

Confidence Interval Values (5)

Local Test Value: 148,231,094 (Outside Confidence Interval)
State Lower Limit: 150,287,814 (State Test Value minus Margin of Error Percent)
State Upper Limit: 173,808,622 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 145,080,152 (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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