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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 537,106,217 0.9998 537,213,660 22 5,681 .002181002
A 536,811,532 0.9783 548,718,728 24 4,369 .001327388
A 536,721,921 0.9723 552,012,672 23 3,368 .002682461
A 536,816,298 0.9796 547,995,404 24 2,075 .005622170
B 46,266,882 1.2637 36,612,235 7 258 .035571071
B 46,417,215 0.8023 57,855,185 5 9 .007175199
B 44,255,280 0.8121 54,494,865 5 6 .054725643
B 43,099,184 0.9101 47,356,537 4 5 .019559059
F1 137,814,407 0.8126 169,596,858 7 390 .097709167
F1 137,243,465 0.9438 145,415,835 7 126 .013302666
F1 138,674,439 0.9174 151,160,278 6 50 .056327271
F1 135,010,377 0.9583 140,885,294 6 19 .022115829
L1 65,774,803 1.0856 60,588,433 7 425 .008398868
L1 65,314,206 1.1313 57,733,763 7 61 .029729462
L1 71,813,642 1.0103 71,081,503 7 18 .017256101
L1 59,139,306 1.0285 57,500,541 5 6 .003897060
Random Totals: 3,138,279,174   3,236,221,791 166 16,866  
Catg D1 Exception Values: 122,105   134,285      
Total Test Values (4): 3,138,401,279   3,236,356,076      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 161,817,804

Confidence Interval Values (5)

State Lower Limit: 3,074,538,272 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,138,401,279 (Within Confidence Interval)
State Upper Limit: 3,398,173,880 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,523,067,472 (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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