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2007 Confidence Interval Detail
246/Williamson
246-904/Georgetown ISD

Category Summary

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

Stratum
Variance
A 815,748,550 1.0092 808,312,079 25 5,455 .003317309
A 815,704,883 0.9982 817,175,799 25 3,945 .009007630
A 816,050,805 0.9975 818,096,045 25 2,853 .002357892
A 815,267,043 0.9898 823,668,461 25 1,831 .004369024
F1 159,615,267 0.9560 166,961,576 9 441 .013498143
F1 160,644,290 0.9155 175,471,644 8 131 .021716015
F1 166,313,626 1.0383 160,178,779 6 38 .005038686
F1 150,264,762 1.0057 149,413,107 4 7 .002805269
Random Totals: 3,899,609,226   3,919,277,490 127 14,701  
Catg D1 Exception Values: 9,880,424   9,548,286      
Total Test Values (4): 3,909,489,650   3,928,825,776      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 196,441,289

Confidence Interval Values (5)

State Lower Limit: 3,732,384,487 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,909,489,650 (Within Confidence Interval)
State Upper Limit: 4,125,267,065 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,512,696,679 (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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