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2009 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 524,320,292 0.9059 578,783,853 50 9,925 .015910014
A 500,454,159 0.9588 521,958,864 50 5,566 .005895275
A 758,322,587 0.9905 765,595,747 50 5,656 .004647535
A 763,479,908 0.9948 767,470,756 48 3,003 .001808897
F1 151,649,127 0.9550 158,794,897 10 1,090 .007197256
F1 157,427,556 1.0090 156,023,346 8 259 .018646212
F1 135,148,650 0.9391 143,912,949 6 62 .059008442
F1 161,175,250 1.0823 148,919,200 6 23 .015353565
L1 85,943,044 0.9991 86,020,462 7 995 .013753065
L1 83,832,803 0.9843 85,169,972 7 188 .046054199
L1 75,568,030 1.0394 72,703,512 6 60 .000532238
L1 96,008,858 1.0289 93,312,137 5 19 .002912392
Random Totals: 3,493,330,264   3,578,665,695 253 26,846  
Catg D1 Exception Values: 6,981,960   7,466,867      
Total Test Values (4): 3,500,312,224   3,586,132,562      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 179,306,628

Confidence Interval Values (5)

State Lower Limit: 3,406,825,934 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,500,312,224 (Within Confidence Interval)
State Upper Limit: 3,765,439,190 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,311,466,103 (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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