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2009 Confidence Interval Detail
091/Grayson
091-914/Sadler-Southmayd ISD

Category Summary

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

Stratum
Variance
A 34,628,167 1.0038 34,497,078 9 613 .001236587
A 32,001,345 1.0912 29,326,746 7 260 .016753875
A 39,252,781 0.9542 41,136,849 7 207 .016148114
A 35,285,998 0.9963 35,417,041 7 89 .000437587
D3 63,036,475 0.8158 77,269,521 18 2,679 .043998957
G1 20,124,793 1.0207 19,716,658 8 43 .028725560
G1 21,127,206 1.0313 20,485,994 4 11 .000114731
G1 23,126,844 0.9953 23,236,053 3 4 .002418631
Random Totals: 268,583,609   281,085,940 63 3,906  
Catg D1 Exception Values: 7,805,481   5,815,398      
Catg G1 Exception Values: 15,184,834   14,367,443      
Total Test Values (4): 291,573,924   301,268,781      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 15,063,439

Confidence Interval Values (5)

State Lower Limit: 286,205,342 (State Test Value minus Margin of Error Percent)
Local Test Value: 291,573,924 (Within Confidence Interval)
State Upper Limit: 316,332,220 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 326,578,103 (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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