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2007 Confidence Interval Detail
114/Howard
114-901/Big Spring ISD

Category Summary

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

Stratum
Variance
A 77,717,766 1.0670 72,837,644 27 3,128 .119940303
A 77,738,342 0.8595 90,446,006 28 1,582 .018643966
A 77,692,530 0.8501 91,392,224 27 925 .042016279
A 77,709,808 0.8842 87,887,139 27 490 .021526397
F1 25,751,526 0.9545 26,979,074 13 387 .067180860
F1 25,898,959 0.9105 28,444,766 11 97 .121854671
F1 27,286,299 0.9411 28,994,048 6 23 .046855606
G1 17,371,248 0.8685 20,001,437 5 24 .073006490
G1 17,310,014 0.9997 17,315,209 4 7 .000245302
G1 22,644,494 1.0499 21,568,239 2 3 .000186155
L1 16,107,130 0.8675 18,567,297 9 326 .099204171
L1 16,075,923 1.0363 15,512,808 6 71 .003187607
L1 17,527,135 0.9800 17,884,832 8 25 .000903952
Random Totals: 496,831,174   537,830,723 173 7,088  
Catg J Exception Values: 27,245,526   26,971,906      
Catg D1 Exception Values: 11,995,452   15,071,887      
Catg F1 Exception Values: 23,608,648   22,625,650      
Catg G1 Exception Values: 40,123,379   40,425,806      
Catg L1 Exception Values: 17,695,201   17,136,200      
Total Test Values (4): 617,499,380   660,062,172      

Margin of Error

Margin of Error Percent: 5.0000001
Margin of Error Value: 33,003,109

Confidence Interval Values (5)

Local Test Value: 617,499,380 (Outside Confidence Interval)
State Lower Limit: 627,059,063 (State Test Value minus Margin of Error Percent)
State Upper Limit: 693,065,281 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,104,545,202 (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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