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2010 Confidence Interval Detail
020/Brazoria
020-907/Columbia-Brazoria ISD

Category Summary

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

Stratum
Variance
A 139,605,726 0.9551 146,168,701 19 2,144 .024519121
A 129,030,664 0.9518 135,564,892 25 1,240 .005513966
A 136,397,075 0.9518 143,304,344 15 937 .006234837
A 138,503,970 0.9169 151,056,789 15 598 .016316614
C 12,673,050 1.0173 12,457,535 14 1,904 .051124154
C 11,740,296 1.0497 11,184,430 12 1,116 .034802833
C 11,639,590 0.9687 12,015,681 10 742 .026392554
C 12,421,830 1.0154 12,233,435 11 343 .053610572
D3 65,022,131 0.9560 68,014,781 20 3,553 .022743367
F1 15,860,818 0.9850 16,102,353 11 191 .077874566
F1 12,969,240 1.0129 12,804,068 9 54 .013423917
F1 15,482,536 0.9515 16,271,714 8 26 .015930575
F1 17,301,050 1.0038 17,235,555 5 12 .011147619
Random Totals: 718,647,976   754,414,278 174 12,860  
Catg J Exception Values: 30,807,317   31,593,290      
Catg D1 Exception Values: 9,327,423   9,421,820      
Total Test Values (4): 758,782,716   795,429,388      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 39,771,469

Confidence Interval Values (5)

State Lower Limit: 755,657,919 (State Test Value minus Margin of Error Percent)
Local Test Value: 758,782,716 (Within Confidence Interval)
State Upper Limit: 835,200,857 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 772,169,592 (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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