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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 58,211,729 0.9379 62,066,029 9 717 .028930434
A 58,231,278 0.9956 58,488,628 12 417 .003140052
A 58,316,308 1.0287 56,689,324 9 309 .004288973
A 58,065,954 0.9984 58,159,008 11 204 .000931854
D3 72,765,599 0.9446 77,033,241 24 1,937 .037389272
F1 6,855,340 0.7412 9,248,975 9 62 .165049361
F1 6,882,516 0.7869 8,746,367 9 20 .044610415
F1 6,731,372 0.8987 7,490,121 4 9 .057562015
Random Totals: 326,060,096   337,921,693 87 3,675  
Catg D1 Exception Values: 4,829,935   3,483,486      
Catg F1 Exception Values: 9,140,125   11,709,063      
Total Test Values (4): 340,030,156   353,114,242      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 17,655,712

Confidence Interval Values (5)

State Lower Limit: 335,458,530 (State Test Value minus Margin of Error Percent)
Local Test Value: 340,030,156 (Within Confidence Interval)
State Upper Limit: 370,769,954 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 352,010,001 (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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