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2007 Confidence Interval Detail
240/Webb
240-904/Webb CISD

Category Summary

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

Stratum
Variance
D3 29,896,659 0.8637 34,614,634 12 2,469 .046013024
G1 323,639,121 1.1183 289,402,773 10 523 .253666271
G1 322,446,256 1.1661 276,516,813 10 223 .039952421
G1 323,057,687 0.9733 331,919,950 9 135 .006801902
G1 322,287,229 0.8910 361,714,062 9 61 .124839256
Random Totals: 1,321,326,952   1,294,168,232 50 3,411  
Catg D1 Exception Values: 24,052,909   39,952,077      
Total Test Values (4): 1,345,379,861   1,334,120,309      

Margin of Error

Margin of Error Percent: 9.5349738
Margin of Error Value: 127,208,022

Confidence Interval Values (5)

State Lower Limit: 1,206,912,287 (State Test Value minus Margin of Error Percent)
Local Test Value: 1,345,379,861 (Within Confidence Interval)
State Upper Limit: 1,461,328,331 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,549,774,108 (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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