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2007 Confidence Interval Detail
057/Dallas
057-912/Irving ISD

Category Summary

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

Stratum
Variance
A 977,087,716 0.9958 981,208,793 49 10,042 .001521902
A 976,752,291 0.9984 978,317,599 49 8,056 .001136475
A 976,897,477 0.9660 1,011,281,032 47 6,176 .030994368
A 976,818,049 0.9844 992,297,896 47 2,686 .007569978
B 280,366,938 0.8198 341,994,313 11 526 .066801166
B 279,897,202 0.9558 292,840,764 6 49 .023748739
B 551,021,465 1.0010 550,470,994 8 34 .011086284
F1 694,951,139 0.8574 810,533,169 12 848 .063015736
F1 693,291,864 0.9301 745,394,973 7 176 .009177565
F1 718,106,966 0.8312 863,940,046 6 54 .051434312
F1 668,709,614 0.9737 686,771,710 5 13 .003827189
L1 261,178,352 1.1720 222,848,423 7 1,159 .047453303
L1 263,524,158 1.0955 240,551,491 7 201 .005494144
L1 266,693,503 1.1257 236,913,479 7 68 .003745140
L1 253,206,502 1.0763 235,256,436 6 15 .009253122
Random Totals: 8,838,503,236   9,190,621,118 274 30,103  
Catg D1 Exception Values: 88,433   67,685      
Total Test Values (4): 8,838,591,669   9,190,688,803      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 459,534,440

Confidence Interval Values (5)

State Lower Limit: 8,731,154,363 (State Test Value minus Margin of Error Percent)
Local Test Value: 8,838,591,669 (Within Confidence Interval)
State Upper Limit: 9,650,223,243 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 9,315,564,755 (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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