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2007 Confidence Interval Detail
091/Grayson
091-908/Van Alstyne ISD

Category Summary

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

Stratum
Variance
A 58,172,938 0.9379 62,024,670 9 717 .028930434
A 58,192,474 0.9956 58,449,652 12 417 .003140052
A 58,277,448 1.0287 56,651,549 9 309 .004288973
A 58,027,260 0.9984 58,120,252 11 204 .000931854
D3 72,238,257 0.9446 76,474,970 24 1,938 .037389272
F1 6,627,748 0.7412 8,941,916 9 62 .165049361
F1 6,654,022 0.7869 8,455,994 9 20 .044610415
F1 6,507,895 0.8987 7,241,454 4 9 .057562015
Random Totals: 324,698,042   336,360,457 87 3,676  
Catg D1 Exception Values: 4,841,815   3,493,742      
Catg F1 Exception Values: 9,140,125   11,709,063      
Total Test Values (4): 338,679,982   351,563,262      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 17,578,163

Confidence Interval Values (5)

State Lower Limit: 333,985,099 (State Test Value minus Margin of Error Percent)
Local Test Value: 338,679,982 (Within Confidence Interval)
State Upper Limit: 369,141,425 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 349,569,638 (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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