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2007 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 662,295,138 1.0074 657,430,155 25 6,281 .049072649
A 662,489,183 1.0089 656,645,042 25 4,059 .008392896
A 661,643,566 1.0294 642,746,810 26 2,901 .012372145
A 662,045,607 0.9835 673,152,625 26 1,836 .003661668
C 54,768,300 0.9893 55,360,659 12 3,055 .022842465
C 54,339,236 1.0133 53,626,010 7 1,746 .000567817
C 54,550,675 1.0146 53,765,696 8 1,297 .008218323
C 54,476,002 1.0827 50,314,955 8 346 .049764520
D3 298,370,437 0.9797 304,552,860 35 6,596 .043522784
F1 90,818,727 0.8450 107,477,783 8 495 .201778966
F1 90,536,969 0.9586 94,447,078 7 148 .017456499
F1 91,925,211 0.8644 106,345,686 6 54 .011221679
F1 88,455,266 0.9490 93,208,921 4 12 .008208663
L1 50,147,395 0.9522 52,664,771 8 543 .008630559
L1 50,552,099 0.9837 51,389,752 7 108 .004625016
L1 51,596,241 0.9038 57,088,118 6 39 .052539328
L1 48,105,431 1.0047 47,880,393 4 12 .002770537
Random Totals: 3,727,115,483   3,758,097,314 222 29,528  
Catg D1 Exception Values: 12,022,596   12,746,378      
Total Test Values (4): 3,739,138,079   3,770,843,692      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 188,542,185

Confidence Interval Values (5)

State Lower Limit: 3,582,301,507 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,739,138,079 (Within Confidence Interval)
State Upper Limit: 3,959,385,877 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,816,618,101 (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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