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2009 Confidence Interval Detail
189/Presidio
189-901/Marfa ISD

Category Summary

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

Stratum
Variance
A 14,879,420 0.8942 16,639,924 17 388 .048426486
A 15,028,590 0.9416 15,960,695 16 221 .051542946
A 14,872,710 1.0307 14,429,718 15 147 .020511739
A 16,045,202 1.1077 14,485,151 15 93 .026587259
D3 16,747,517 0.9372 17,869,736 21 5,153 .086947428
F1 3,193,690 0.9317 3,427,809 6 74 .019217085
F1 3,608,990 1.0093 3,575,736 6 34 .018288933
F1 4,062,610 0.8473 4,794,772 5 16 .037946869
F1 2,634,546 0.2808 9,382,286 2 3 .706808740
Random Totals: 91,073,275   100,565,827 103 6,129  
Catg J Exception Values: 18,494,132   18,610,747      
Catg D1 Exception Values: 12,905,230   15,514,768      
Total Test Values (4): 122,472,637   134,691,342      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 6,734,567

Confidence Interval Values (5)

Local Test Value: 122,472,637 (Outside Confidence Interval)
State Lower Limit: 127,956,775 (State Test Value minus Margin of Error Percent)
State Upper Limit: 141,425,909 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 131,994,405 (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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