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2009 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 59,604,583 0.9902 60,194,489 15 680 .030954312
A 57,870,208 1.0031 57,691,365 17 411 .001942887
A 57,997,233 1.0218 56,759,868 18 318 .009615536
A 63,897,228 1.0314 61,951,937 15 231 .027186979
D3 72,760,951 0.9769 74,481,473 10 1,698 .006007181
F1 6,527,726 1.0681 6,111,531 6 60 .014091702
F1 7,738,791 0.7978 9,700,164 5 25 .028274838
F1 8,800,072 0.7656 11,494,347 7 13 .175190789
Random Totals: 335,196,792   338,385,174 93 3,436  
Catg J Exception Values: 20,332,060   22,258,211      
Catg D1 Exception Values: 3,724,373   2,925,236      
Catg F1 Exception Values: 6,719,394   8,131,278      
Total Test Values (4): 365,972,619   371,699,899      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 18,584,995

Confidence Interval Values (5)

State Lower Limit: 353,114,904 (State Test Value minus Margin of Error Percent)
Local Test Value: 365,972,619 (Within Confidence Interval)
State Upper Limit: 390,284,894 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 374,157,857 (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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