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2010 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 511,071,780 0.9794 521,821,299 25 6,390 .007431710
A 502,811,050 0.9821 511,975,410 25 4,407 .003353506
A 498,928,150 0.9858 506,114,983 25 3,371 .002663862
A 462,113,560 0.9864 468,484,955 25 1,996 .004637536
B 50,381,720 0.9844 51,180,130 12 188 .004212926
B 43,662,870 0.7356 59,356,811 5 9 .039674233
B 54,401,880 0.9202 59,119,626 4 8 .003220902
B 24,081,100 0.9297 25,902,011 2 2 .001252765
F1 146,106,610 0.8993 162,467,041 10 388 .027218966
F1 141,630,500 0.9381 150,975,909 9 130 .059597548
F1 136,787,730 0.8884 153,970,880 9 55 .032682562
F1 124,733,740 0.9474 131,659,004 7 18 .004189815
L1 62,530,850 1.0936 57,178,905 10 381 .010441867
L1 57,953,350 1.0084 57,470,597 9 60 .007707901
L1 64,002,860 1.0272 62,308,080 7 19 .075183080
L1 45,040,150 1.0118 44,514,874 4 6 .000163572
Random Totals: 2,926,237,900   3,024,500,515 188 17,428  
Catg J Exception Values: 51,214,542   57,257,460      
Catg D1 Exception Values: 108,130   100,746      
Total Test Values (4): 2,977,560,572   3,081,858,721      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 154,092,936

Confidence Interval Values (5)

State Lower Limit: 2,927,765,785 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,977,560,572 (Within Confidence Interval)
State Upper Limit: 3,235,951,657 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,192,275,922 (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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