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2007 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 39,241,523 0.8822 44,481,436 7 1,864 .078890730
A 39,274,200 0.8409 46,704,959 7 982 .007885962
A 39,235,331 0.8262 47,488,902 7 587 .005546373
A 39,197,282 0.9160 42,791,793 7 311 .016196519
G1 647,054,567 1.0290 628,818,821 15 916 .059379258
G1 647,260,510 1.0315 627,494,435 15 349 .092671397
G1 645,316,800 0.9418 685,195,158 15 184 .030887857
G1 644,750,936 1.0957 588,437,470 15 85 .045164987
Random Totals: 2,741,331,149   2,711,412,974 88 5,278  
Catg D1 Exception Values: 26,144,169   47,336,012      
Total Test Values (4): 2,767,475,318   2,758,748,986      

Margin of Error

Margin of Error Percent: 5.4196214
Margin of Error Value: 149,513,751

Confidence Interval Values (5)

State Lower Limit: 2,609,235,235 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,767,475,318 (Within Confidence Interval)
State Upper Limit: 2,908,262,737 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,156,456,653 (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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