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2009 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 955,785,786 0.9833 972,018,495 59 6,481 .003973015
A 941,164,269 0.9867 953,850,480 55 4,625 .007192876
A 916,606,907 0.9686 946,321,399 57 3,281 .005198534
A 901,967,396 0.9576 941,904,131 54 2,026 .010176295
D3 207,778,132 0.9982 208,152,807 21 3,053 .078680410
F1 204,356,477 0.8282 246,747,738 9 463 .052085022
F1 207,801,712 0.9742 213,304,980 7 123 .036593330
F1 212,264,341 1.0111 209,934,073 6 33 .002399083
F1 173,456,993 0.9758 177,758,755 2 3 .001983597
Random Totals: 4,721,182,013   4,869,992,858 270 20,088  
Catg D1 Exception Values: 11,638,410   8,861,283      
Total Test Values (4): 4,732,820,423   4,878,854,141      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 243,942,707

Confidence Interval Values (5)

State Lower Limit: 4,634,911,434 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,732,820,423 (Within Confidence Interval)
State Upper Limit: 5,122,796,848 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,216,540,233 (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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