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2006 Confidence Interval Detail
057/Dallas
057-907/Duncanville ISD

Category Summary

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

Stratum
Variance
A 506,961,264 1.0174 498,291,001 46 5,447 .001653629
A 506,970,283 1.0091 502,398,457 45 4,253 .001558727
A 506,727,926 1.0097 501,859,885 46 3,312 .004437509
A 506,807,324 1.0172 498,237,637 48 2,069 .002687218
B 40,631,689 0.9989 40,676,433 7 256 .000525188
B 41,354,959 0.8370 49,408,553 7 9 .001487907
B 38,751,526 0.7803 49,662,343 5 6 .089767431
F1 123,275,838 1.0189 120,989,143 7 382 .060818969
F1 123,881,897 0.9527 130,032,431 7 129 .051854107
F1 124,599,260 0.9762 127,637,021 6 51 .035217442
F1 120,440,030 1.0087 119,401,239 5 22 .001709575
L1 63,055,081 1.1060 57,011,827 7 467 .030244564
L1 63,432,264 1.0894 58,226,789 6 72 .021407583
L1 66,170,325 1.0914 60,628,848 7 20 .007614465
Random Totals: 2,833,059,666   2,814,461,607 249 16,495  
Catg D1 Exception Values: 82,364   83,531      
Catg B Exception Values: 38,260,200   46,020,000      
Catg L1 Exception Values: 55,645,800   55,345,801      
Total Test Values (4): 2,927,048,030   2,915,910,939      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 145,795,547

Confidence Interval Values (5)

State Lower Limit: 2,770,115,392 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,927,048,030 (Within Confidence Interval)
State Upper Limit: 3,061,706,486 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,239,918,317 (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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