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2008 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 647,993,702 1.0060 644,128,928 40 6,712 .003598175
A 717,829,926 0.9992 718,404,650 46 4,738 .003360727
A 787,515,489 0.9981 789,014,617 49 3,816 .002814208
A 801,897,282 1.0250 782,338,812 49 2,525 .010562198
C 47,250,455 0.9631 49,060,798 12 2,649 .028111949
C 40,240,775 1.0330 38,955,252 19 1,267 .013963497
C 61,394,721 0.9860 62,266,451 13 600 .004274606
C 86,809,790 0.9552 90,881,271 5 24 .030352064
D3 307,641,905 0.8805 349,394,554 40 6,707 .444445823
F1 93,182,564 0.7188 129,636,288 14 501 .211920065
F1 95,968,581 0.8820 108,807,915 10 162 .116749098
F1 105,242,665 0.8565 122,875,266 6 63 .023645746
F1 148,563,410 0.9823 151,240,364 5 18 .007322981
Random Totals: 3,941,531,265   4,037,005,166 308 29,782  
Catg D1 Exception Values: 12,285,390   13,552,165      
Total Test Values (4): 3,953,816,655   4,050,557,331      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 202,527,867

Confidence Interval Values (5)

State Lower Limit: 3,848,029,464 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,953,816,655 (Within Confidence Interval)
State Upper Limit: 4,253,085,198 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,883,532,038 (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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