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2009 Confidence Interval Detail
226/Tom Green
226-906/Wall ISD

Category Summary

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

Stratum
Variance
A 27,452,450 1.0890 25,208,861 17 325 .029607272
A 40,109,700 1.0196 39,338,662 16 263 .010274454
A 41,685,300 0.9456 44,083,439 16 189 .010946035
A 38,450,200 1.0146 37,896,905 21 103 .004402399
D3 50,707,712 0.9821 51,631,923 22 2,494 .008910402
G1 5,866,178 1.1205 5,235,322 5 14 .080214284
Random Totals: 204,271,540   203,395,112 97 3,388  
Catg D1 Exception Values: 34,732,170   38,036,022      
Catg G1 Exception Values: 17,669,100   12,588,796      
Total Test Values (4): 256,672,810   254,019,930      

Margin of Error

Margin of Error Percent: 5.0000002
Margin of Error Value: 12,700,997

Confidence Interval Values (5)

State Lower Limit: 241,318,933 (State Test Value minus Margin of Error Percent)
Local Test Value: 256,672,810 (Within Confidence Interval)
State Upper Limit: 266,720,927 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 253,096,398 (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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