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2009 Confidence Interval Detail
227/Travis
227-901/Austin ISD

Category Summary

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

Stratum
Variance
A 8,244,848,176 0.9923 8,308,826,137 100 51,735 .005438595
A 9,655,667,691 0.9943 9,711,020,508 99 39,556 .008049422
A 9,584,719,196 0.9877 9,704,079,372 100 26,028 .007681684
A 9,735,216,493 0.9885 9,848,473,943 99 13,282 .008261224
B 1,955,519,538 1.0554 1,852,870,512 56 7,573 .016197924
B 1,904,547,399 0.9705 1,962,439,360 12 916 .004803039
B 2,430,269,977 0.9771 2,487,227,486 7 158 .015031132
B 1,744,111,026 1.0162 1,716,306,855 6 47 .001655661
C 181,562,588 0.9698 187,216,527 21 2,101 .024212546
C 166,042,887 0.9856 168,468,838 19 656 .010723489
C 167,168,186 0.8580 194,834,716 7 269 .080609499
C 142,941,022 1.0202 140,110,784 6 55 .028232200
F1 3,786,174,312 0.9841 3,847,347,131 49 4,174 .017157451
F1 3,736,519,905 0.9644 3,874,450,337 15 846 .007647904
F1 3,494,444,543 0.9636 3,626,447,222 16 227 .001951859
F1 3,315,289,661 0.9695 3,419,587,067 15 63 .001389156
L1 847,774,156 1.1384 744,706,743 7 6,590 .042390565
L1 832,767,229 0.9654 862,613,662 7 1,217 .002491977
L1 819,063,148 0.9735 841,359,166 7 348 .007621230
L1 877,753,679 1.0479 837,631,147 6 75 .004584560
Random Totals: 63,622,400,812   64,336,017,513 654 155,916  
Catg D1 Exception Values: 2,086,014   1,706,541      
Total Test Values (4): 63,624,486,826   64,337,724,054      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 3,216,886,203

Confidence Interval Values (5)

State Lower Limit: 61,120,837,851 (State Test Value minus Margin of Error Percent)
Local Test Value: 63,624,486,826 (Within Confidence Interval)
State Upper Limit: 67,554,610,257 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 61,899,156,368 (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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