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2006 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 183,152,806 1.0146 180,517,254 48 2,345 .030181091
A 183,094,305 1.0003 183,039,393 47 1,520 .004826658
A 183,074,185 0.9887 185,166,567 61 1,243 .003014646
A 182,961,561 1.0099 181,167,998 54 853 .002292176
B 77,993,992 1.0819 72,089,835 6 87 .024069724
B 70,295,066 0.9650 72,844,628 4 7 .002818406
B 88,311,358 0.9968 88,594,862 3 5 .005880115
D3 161,363,590 0.9813 164,438,592 23 3,717 .004274881
F1 103,870,137 1.0356 100,299,476 7 196 .032128189
F1 104,923,119 0.9802 107,042,562 6 46 .012236551
F1 109,223,307 0.9584 113,964,218 6 19 .003576382
L1 104,851,773 0.9879 106,136,019 7 256 .013464208
L1 106,359,047 0.9625 110,502,906 6 51 .018672874
L1 105,616,051 0.9439 111,893,263 5 18 .002402729
L1 98,738,450 1.0226 96,556,278 3 5 .001681793
Random Totals: 1,863,828,747   1,874,253,851 286 10,368  
Catg D1 Exception Values: 9,271,378   8,924,149      
Catg B Exception Values: 52,972,272   54,823,475      
Catg F1 Exception Values: 74,348,883   70,769,452      
Total Test Values (4): 2,000,421,280   2,008,770,927      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 100,438,546

Confidence Interval Values (5)

State Lower Limit: 1,908,332,381 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,000,421,280 (Within Confidence Interval)
State Upper Limit: 2,109,209,473 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,550,513,616 (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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