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2011 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 49,180,871 0.9109 53,991,515 10 1,737 .178916052
A 66,749,411 0.9638 69,256,496 9 1,202 .041762591
A 70,647,292 1.0063 70,205,000 10 750 .014874262
A 93,117,656 1.1761 79,174,948 11 488 .032148709
G1 358,817,211 0.9956 360,402,984 10 965 .008052860
G1 359,096,260 0.9819 365,715,714 10 397 .032117472
G1 359,304,092 1.0111 355,359,600 10 214 .012771601
G1 357,493,622 0.9505 376,111,123 10 79 .035695346
Random Totals: 1,714,406,415   1,730,217,380 80 5,832  
Catg D1 Exception Values: 28,992,336   49,686,011      
Total Test Values (4): 1,743,398,751   1,779,903,391      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 88,995,170

Confidence Interval Values (5)

State Lower Limit: 1,690,908,221 (State Test Value minus Margin of Error Percent)
Local Test Value: 1,743,398,751 (Within Confidence Interval)
State Upper Limit: 1,868,898,561 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,102,469,701 (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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