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2006 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 543,758,638 0.9928 547,702,093 39 5,651 .004483634
A 543,208,229 0.9708 559,547,001 39 3,664 .013000622
A 543,515,910 0.9918 548,009,589 45 2,610 .002037554
A 543,107,637 0.9786 554,984,301 46 1,652 .005273465
C 46,249,945 0.9365 49,385,953 10 3,054 .032162762
C 43,177,220 0.9026 47,836,495 7 1,526 .061414888
C 44,741,612 0.8710 51,368,096 7 1,219 .061562253
C 44,599,223 0.9932 44,904,574 8 494 .000560601
D3 263,405,880 0.9188 286,684,676 23 6,539 .160833066
F1 74,067,840 0.9594 77,202,251 9 479 .033233772
F1 74,652,982 1.0123 73,745,907 10 159 .032924893
F1 74,380,831 0.9844 75,559,560 9 59 .009955880
F1 72,885,209 1.0156 71,765,665 10 13 .004531538
L1 43,311,341 0.9731 44,508,623 9 549 .011801009
L1 42,836,108 0.9894 43,295,035 9 111 .019750406
L1 43,122,905 0.9954 43,322,187 8 35 .009040729
L1 42,414,113 1.0055 42,182,111 6 11 .001627463
Random Totals: 3,083,435,623   3,162,004,117 294 27,825  
Catg D1 Exception Values: 12,082,160   12,979,807      
Total Test Values (4): 3,095,517,783   3,174,983,924      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 158,749,196

Confidence Interval Values (5)

State Lower Limit: 3,016,234,728 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,095,517,783 (Within Confidence Interval)
State Upper Limit: 3,333,733,120 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,116,471,681 (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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