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2006 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 36,677,055 0.8932 41,062,534 10 1,968 .021777403
A 36,695,211 0.9691 37,865,247 9 1,030 .031155501
A 36,681,283 0.8512 43,093,613 9 610 .019944278
A 36,628,442 0.9357 39,145,497 7 312 .003256219
G1 690,639,487 1.0088 684,614,876 10 839 .047786561
G1 691,273,267 1.1706 590,529,017 10 323 .043320509
G1 691,680,085 1.1678 592,293,274 9 174 .094643205
G1 686,651,739 1.1377 603,543,763 9 78 .022088106
Random Totals: 2,906,926,569   2,632,147,821 73 5,334  
Catg D1 Exception Values: 25,694,642   48,097,803      
Total Test Values (4): 2,932,621,211   2,680,245,624      

Margin of Error

Margin of Error Percent: 6.6488600
Margin of Error Value: 178,205,778

Confidence Interval Values (5)

State Lower Limit: 2,502,039,846 (State Test Value minus Margin of Error Percent)
State Upper Limit: 2,858,451,402 (State Test Value plus Margin of Error Percent)
Local Test Value: 2,932,621,211 (Outside Confidence Interval)
Value Assigned (6): 3,285,314,134 (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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