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2009 Confidence Interval Detail
246/Williamson
246-914/Coupland ISD

Category Summary

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

Stratum
Variance
A 4,318,927 0.9906 4,359,910 7 66 .013404508
A 3,113,660 1.0018 3,108,065 6 32 .006448217
A 4,458,887 0.9944 4,483,997 6 33 .004694743
A 3,506,666 1.0099 3,472,290 5 15 .003992613
D3 24,230,296 0.9639 25,137,769 26 791 .011065778
Random Totals: 39,628,436   40,562,031 50 937  
Catg J Exception Values: 4,339,558   4,372,694      
Catg D1 Exception Values: 5,817,749   4,442,661      
Total Test Values (4): 49,785,743   49,377,386      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 2,468,869

Confidence Interval Values (5)

State Lower Limit: 46,908,517 (State Test Value minus Margin of Error Percent)
Local Test Value: 49,785,743 (Within Confidence Interval)
State Upper Limit: 51,846,255 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 50,670,469 (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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