taxes Property Tax

School and Appraisal Districts Property Value Study 2012 Report

2012 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 823,769,568 1.0179 809,283,395 34 8,062 .011596214
A 819,352,582 1.0374 789,813,555 48 5,205 .012239910
A 808,396,974 1.0357 780,531,982 40 3,899 .014877610
A 820,540,015 1.0124 810,489,940 44 2,665 .014111645
D3 283,698,353 0.9771 290,347,306 33 4,959 .006243890
F1 163,781,096 1.0790 151,789,709 10 539 .015664055
F1 156,398,735 1.0290 151,990,996 9 133 .012089094
F1 182,271,880 1.0370 175,768,447 8 46 .003316734
F1 119,889,385 0.9171 130,726,622 5 7 .015159216
L1 71,986,810 1.0746 66,989,401 10 624 .006162365
L1 80,673,720 0.9574 84,263,338 9 145 .037032420
L1 81,316,370 0.9955 81,683,948 8 41 .000372817
L1 70,554,190 0.9252 76,258,312 5 12 .021627432
Random Totals: 4,482,629,678   4,399,936,951 263 26,337  
Catg D1 Exception Values: 15,660,993   14,192,982      
Total Test Values (4): 4,498,290,671   4,414,129,933      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 220,706,497

Confidence Interval Values (5)

State Lower Limit: 4,193,423,436 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,498,290,671 (Within Confidence Interval)
State Upper Limit: 4,634,836,430 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,956,058,555 (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