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2008 Confidence Interval Detail
227/Travis
227-910/Del Valle ISD

Category Summary

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

Stratum
Variance
A 223,387,062 0.9698 230,343,434 55 2,847 .028688444
A 246,914,995 0.9703 254,472,838 53 2,278 .011548642
A 225,451,060 1.0107 223,064,272 57 1,728 .013245469
A 330,591,412 1.0315 320,495,794 57 1,740 .013090280
B 73,618,318 0.7708 95,508,975 6 61 .007266512
B 80,720,395 0.9864 81,833,328 4 7 .001524535
B 76,801,481 0.9745 78,811,166 3 4 .000340278
D3 136,776,464 1.0710 127,709,117 14 3,048 .072480850
F1 155,303,206 0.9779 158,812,973 7 240 .014934270
F1 179,621,134 0.9522 188,638,032 6 55 .011796707
F1 169,538,125 0.9658 175,541,649 5 20 .003835165
F1 122,712,056 0.9918 123,726,614 4 5 .006290358
L1 108,858,086 0.9780 111,306,836 7 251 .001332415
L1 129,403,186 0.9808 131,936,364 6 50 .001583075
L1 134,632,536 0.9975 134,969,961 5 18 .004902369
L1 136,914,076 0.9995 136,982,567 3 7 .000000258
Random Totals: 2,531,243,592   2,574,153,920 292 12,359  
Catg D1 Exception Values: 9,512,590   7,248,279      
Catg B Exception Values: 85,564,463   87,250,000      
Total Test Values (4): 2,626,320,645   2,668,652,199      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 133,432,610

Confidence Interval Values (5)

State Lower Limit: 2,535,219,589 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,626,320,645 (Within Confidence Interval)
State Upper Limit: 2,802,084,809 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,252,921,349 (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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