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2009 Confidence Interval Detail
245/Willacy
245-902/Lyford CISD

Category Summary

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

Stratum
Variance
A 12,077,396 0.8677 13,918,861 15 643 .059980376
A 11,309,179 0.9453 11,963,587 15 340 .009771912
A 12,000,862 0.9443 12,708,739 16 237 .014221736
A 13,118,146 1.0543 12,442,517 15 128 .015766339
D3 18,970,203 0.9522 19,922,498 20 2,590 .271659819
G1 23,028,010 1.0500 21,931,438 15 36 .048462362
L1 443,646 0.8259 537,167 5 14 .021287563
L1 877,703 1.0503 835,669 4 9 .026331813
Random Totals: 91,825,145   94,260,476 105 3,997  
Catg J Exception Values: 6,236,926   6,525,773      
Catg D1 Exception Values: 40,687,577   42,807,264      
Catg G1 Exception Values: 25,981,698   24,996,946      
Catg L1 Exception Values: 3,471,555   3,397,264      
Total Test Values (4): 168,202,901   171,987,723      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 8,599,386

Confidence Interval Values (5)

State Lower Limit: 163,388,337 (State Test Value minus Margin of Error Percent)
Local Test Value: 168,202,901 (Within Confidence Interval)
State Upper Limit: 180,587,109 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 168,453,327 (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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