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2010 Confidence Interval Detail
020/Brazoria
020-901/Alvin ISD

Category Summary

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

Stratum
Variance
A 761,189,458 0.9361 813,149,725 27 7,543 .014359497
A 766,069,273 0.9857 777,182,990 33 4,860 .008022526
A 792,958,158 1.0188 778,325,636 24 3,782 .007749914
A 756,588,904 0.9912 763,305,997 17 2,404 .006704535
D3 301,572,149 1.0085 299,030,391 16 6,708 .060341941
F1 156,742,300 1.0079 155,513,741 10 517 .025690304
F1 163,758,098 1.0543 155,324,005 9 128 .007481856
F1 165,302,029 1.0117 163,390,362 8 35 .006311124
F1 117,569,809 0.8929 131,671,866 4 7 .011774342
L1 74,176,880 1.0206 72,679,679 11 612 .006221183
L1 65,442,590 0.9711 67,390,166 10 106 .008263695
L1 69,483,270 0.9855 70,505,601 9 34 .019073749
L1 67,017,750 0.9513 70,448,597 5 11 .002693711
Random Totals: 4,257,870,668   4,317,918,756 183 26,747  
Catg J Exception Values: 85,578,479   89,645,763      
Catg D1 Exception Values: 14,086,864   14,257,455      
Total Test Values (4): 4,357,536,011   4,421,821,974      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 221,091,099

Confidence Interval Values (5)

State Lower Limit: 4,200,730,875 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,357,536,011 (Within Confidence Interval)
State Upper Limit: 4,642,913,073 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,637,836,268 (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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