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2008 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 789,100,327 1.0036 786,269,756 25 5,563 .007963986
A 923,968,223 1.0121 912,921,868 25 4,769 .003790674
A 904,433,471 0.9907 912,923,661 25 3,437 .006007309
A 1,091,733,247 0.9920 1,100,537,547 24 2,554 .004755992
F1 168,194,625 0.8561 196,466,096 12 453 .051458240
F1 201,100,417 0.8581 234,355,456 7 148 .053715481
F1 163,647,879 0.9955 164,387,623 6 38 .003243649
F1 274,620,613 1.0454 262,694,292 5 10 .000951387
Random Totals: 4,516,798,802   4,570,556,299 129 16,972  
Catg D1 Exception Values: 10,377,292   8,621,677      
Total Test Values (4): 4,527,176,094   4,579,177,976      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 228,958,899

Confidence Interval Values (5)

State Lower Limit: 4,350,219,077 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,527,176,094 (Within Confidence Interval)
State Upper Limit: 4,808,136,875 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,207,106,251 (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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