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2008 Confidence Interval Detail
253/Zapata
253-901/Zapata ISD

Category Summary

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

Stratum
Variance
A 34,487,316 0.8775 39,301,785 7 1,639 .114995136
A 46,441,116 0.9664 48,055,791 8 1,169 .051403195
A 50,137,595 1.0060 49,838,564 7 757 .039069081
A 68,021,110 0.8758 77,667,401 7 504 .009802639
G1 692,090,520 1.0096 685,509,628 18 951 .076099592
G1 693,075,967 1.0443 663,675,158 17 378 .019322677
G1 693,766,433 1.0858 638,944,956 15 205 .105363920
G1 686,540,544 1.4256 481,580,067 15 87 .677349265
Random Totals: 2,964,560,601   2,684,573,350 94 5,690  
Catg D1 Exception Values: 25,878,988   48,581,604      
Total Test Values (4): 2,990,439,589   2,733,154,954      

Margin of Error

Margin of Error Percent: 8.5360368
Margin of Error Value: 233,303,113

Confidence Interval Values (5)

State Lower Limit: 2,499,851,841 (State Test Value minus Margin of Error Percent)
State Upper Limit: 2,966,458,067 (State Test Value plus Margin of Error Percent)
Local Test Value: 2,990,439,589 (Outside Confidence Interval)
Value Assigned (6): 3,438,582,875 (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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