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2007 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 12,968,615 0.8403 15,433,315 22 382 .035208136
A 12,950,471 0.9521 13,602,007 24 214 .040517869
A 13,037,687 1.0174 12,814,711 19 145 .050856235
A 12,878,104 1.1501 11,197,378 25 84 .021873887
D3 16,246,926 1.0902 14,902,702 35 4,783 .037396517
F1 3,199,806 0.8648 3,700,053 19 77 .041096879
F1 3,084,249 1.0420 2,959,932 17 29 .035295183
F1 3,564,745 0.9896 3,602,208 8 10 .018293352
Random Totals: 77,930,603   78,212,306 169 5,724  
Catg J Exception Values: 16,224,546   16,242,954      
Catg D1 Exception Values: 12,964,500   14,951,284      
Catg F1 Exception Values: 2,190,680   2,203,336      
Total Test Values (4): 109,310,329   111,609,880      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 5,580,494

Confidence Interval Values (5)

State Lower Limit: 106,029,386 (State Test Value minus Margin of Error Percent)
Local Test Value: 109,310,329 (Within Confidence Interval)
State Upper Limit: 117,190,374 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 121,375,955 (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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