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2007 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 536,912,007 0.9998 537,019,411 22 5,681 .002181002
A 536,617,428 0.9783 548,520,319 24 4,369 .001327388
A 536,527,850 0.9723 551,813,072 23 3,368 .002682461
A 536,622,192 0.9796 547,797,256 24 2,075 .005622170
B 45,406,341 1.2637 35,931,266 7 258 .035571071
B 45,553,878 0.8023 56,779,108 5 9 .007175199
B 43,432,153 0.8121 53,481,287 5 6 .054725643
B 42,297,561 0.9101 46,475,729 4 5 .019559059
F1 135,568,152 0.8126 166,832,577 7 390 .097709167
F1 135,006,516 0.9438 143,045,683 7 126 .013302666
F1 136,414,166 0.9174 148,696,497 6 50 .056327271
F1 132,809,825 0.9583 138,588,986 6 19 .022115829
L1 63,194,454 1.0856 58,211,546 7 425 .008398868
L1 62,751,926 1.1313 55,468,864 7 61 .029729462
L1 68,996,389 1.0103 68,292,971 7 18 .017256101
L1 56,819,268 1.0285 55,244,791 5 6 .003897060
Random Totals: 3,114,930,106   3,212,199,363 166 16,866  
Catg D1 Exception Values: 122,105   134,046      
Total Test Values (4): 3,115,052,211   3,212,333,409      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 160,616,670

Confidence Interval Values (5)

State Lower Limit: 3,051,716,739 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,115,052,211 (Within Confidence Interval)
State Upper Limit: 3,372,950,079 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,495,429,274 (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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