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2009 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 215,716,576 0.9731 221,679,762 25 2,625 .022118992
A 266,857,484 0.9729 274,290,764 33 2,375 .009342134
A 314,957,544 1.0207 308,570,142 56 2,272 .006244239
A 293,618,617 1.0573 277,706,060 26 1,437 .011048645
B 96,643,608 0.9935 97,275,901 6 80 .000646199
B 73,158,287 0.9853 74,249,758 4 6 .006806883
B 144,786,371 0.9802 147,711,050 5 6 .003190280
D3 138,503,569 1.0274 134,809,781 10 2,991 .004701989
F1 164,566,844 1.0117 162,663,679 7 250 .003517349
F1 149,475,893 0.9867 151,490,720 6 50 .009254808
F1 164,899,373 0.9826 167,819,431 7 22 .007616983
F1 144,151,103 1.0159 141,894,973 4 8 .001085207
L1 128,554,373 1.0545 121,910,264 8 248 .071337906
L1 126,178,589 0.9756 129,334,347 7 40 .013584362
L1 111,757,948 0.9938 112,455,170 5 12 .027956860
L1 106,596,392 0.9973 106,884,981 3 5 .000113072
Random Totals: 2,640,422,571   2,630,746,783 212 12,427  
Catg D1 Exception Values: 9,337,023   7,784,468      
Total Test Values (4): 2,649,759,594   2,638,531,251      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 131,926,563

Confidence Interval Values (5)

State Lower Limit: 2,506,604,688 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,649,759,594 (Within Confidence Interval)
State Upper Limit: 2,770,457,814 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,189,092,969 (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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