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2007 Confidence Interval Detail
226/Tom Green
226-903/San Angelo ISD

Category Summary

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

Stratum
Variance
A 520,073,866 0.8402 618,988,177 52 10,545 .099622208
A 520,330,209 0.8609 604,402,612 54 5,881 .024440519
A 520,243,856 0.9028 576,255,933 51 3,991 .012132667
A 519,123,611 0.9195 564,571,627 57 2,147 .022466765
F1 146,128,717 0.8939 163,473,226 16 1,070 .026681661
F1 146,094,075 0.9484 154,042,677 16 272 .005588048
F1 147,460,804 0.9720 151,708,646 14 70 .025056576
F1 143,763,880 0.9629 149,303,022 10 20 .002102396
L1 75,890,098 0.9674 78,447,486 7 985 .000447748
L1 75,892,496 0.9830 77,204,981 7 189 .000099797
L1 76,160,198 0.9881 77,077,419 8 60 .000551118
L1 74,962,210 1.0125 74,036,751 7 16 .003637405
Random Totals: 2,966,124,020   3,289,512,557 299 25,246  
Catg D1 Exception Values: 6,373,470   6,262,673      
Total Test Values (4): 2,972,497,490   3,295,775,230      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 164,788,762

Confidence Interval Values (5)

Local Test Value: 2,972,497,490 (Outside Confidence Interval)
State Lower Limit: 3,130,986,468 (State Test Value minus Margin of Error Percent)
State Upper Limit: 3,460,563,992 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,955,169,446 (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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