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2007 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 3,766,027 0.9932 3,791,811 8 59 .013061573
A 3,787,485 0.9424 4,018,978 8 40 .012134914
A 3,730,251 0.9611 3,881,231 7 28 .006325196
A 3,740,516 0.9644 3,878,594 7 18 .002587699
D3 21,387,423 0.9763 21,906,610 26 771 .087147618
Random Totals: 36,411,702   37,477,224 56 916  
Catg J Exception Values: 4,719,186   4,672,230      
Catg D1 Exception Values: 4,551,398   4,555,560      
Total Test Values (4): 45,682,286   46,705,014      

Margin of Error

Margin of Error Percent: 5.4432828
Margin of Error Value: 2,542,286

Confidence Interval Values (5)

State Lower Limit: 44,162,728 (State Test Value minus Margin of Error Percent)
Local Test Value: 45,682,286 (Within Confidence Interval)
State Upper Limit: 49,247,300 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 46,618,256 (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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