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2007 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 7,555,767,206 0.9614 7,859,129,609 25 52,554 .001962895
A 7,555,526,861 0.9639 7,838,496,588 25 33,817 .004033888
A 7,555,895,854 0.9657 7,824,268,255 25 22,031 .012093120
A 7,555,264,951 0.9651 7,828,478,863 25 10,489 .004785633
B 1,676,939,764 0.9595 1,747,722,526 49 8,041 .042646241
B 1,677,652,534 0.8616 1,947,136,182 43 1,294 .294826488
B 1,691,082,216 0.9286 1,821,109,429 7 144 .006048526
B 1,661,977,125 0.9397 1,768,625,226 7 52 .005240420
C 173,994,641 0.9307 186,950,297 20 2,597 .023041438
C 166,924,223 0.9577 174,296,985 18 651 .024706542
C 170,518,746 0.9971 171,014,689 13 249 .027411361
C 169,952,722 0.9947 170,858,271 6 48 .009962269
F1 3,253,575,781 0.8971 3,626,770,461 36 3,866 .031830227
F1 3,254,762,273 0.9097 3,577,841,347 11 841 .016784370
F1 3,261,126,055 0.9673 3,371,369,849 10 254 .037849958
F1 3,241,962,039 0.9720 3,335,351,892 9 67 .004394153
L1 759,479,349 0.9680 784,586,104 7 6,609 .003676941
L1 759,283,427 0.9644 787,311,724 8 1,233 .006061859
L1 762,378,049 1.0140 751,852,119 7 369 .013274532
L1 756,318,921 0.9765 774,520,144 8 98 .005443734
Random Totals: 53,660,382,737   56,347,690,560 359 145,304  
Catg D1 Exception Values: 1,892,365   1,597,161      
Total Test Values (4): 53,662,275,102   56,349,287,721      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 2,817,464,386

Confidence Interval Values (5)

State Lower Limit: 53,531,823,335 (State Test Value minus Margin of Error Percent)
Local Test Value: 53,662,275,102 (Within Confidence Interval)
State Upper Limit: 59,166,752,107 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 53,030,915,597 (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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