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2009 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 43,906,558 0.8509 51,600,139 17 2,858 .089769908
G1 288,017,688 0.9516 302,666,759 15 500 .024678642
G1 288,189,631 1.0124 284,659,849 15 205 .004772567
G1 286,083,983 1.0318 277,266,896 15 121 .003991203
G1 286,698,243 1.0074 284,592,260 15 68 .003243444
Random Totals: 1,192,896,103   1,200,785,903 77 3,752  
Catg D1 Exception Values: 25,314,068   38,741,392      
Total Test Values (4): 1,218,210,171   1,239,527,295      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 61,976,365

Confidence Interval Values (5)

State Lower Limit: 1,177,550,930 (State Test Value minus Margin of Error Percent)
Local Test Value: 1,218,210,171 (Within Confidence Interval)
State Upper Limit: 1,301,503,660 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,441,615,732 (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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