taxes Property Tax

School and Appraisal Districts Property Value Study 2012 Report

2012 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 994,579,850 0.9668 1,028,733,813 10 11,840 .001129625
A 782,864,640 1.0113 774,117,117 10 6,961 .001407533
A 890,109,910 1.0406 855,381,424 10 5,629 .002757296
A 888,155,260 0.9958 891,901,245 10 2,318 .004000406
B 234,884,260 0.8095 290,159,679 11 389 .119403828
B 247,866,650 0.7781 318,553,721 9 46 .080102141
B 236,450,860 0.9307 254,057,011 7 21 .019298713
B 322,200,000 0.7009 459,694,678 4 10 .020340000
C 59,163,150 0.8253 71,686,841 19 1,139 .089253703
C 61,472,870 0.8637 71,173,868 9 169 .061151851
C 54,362,480 0.9543 56,965,818 8 46 .032563203
C 61,477,090 0.9509 64,651,478 6 19 .025441822
F1 570,892,960 0.9418 606,172,181 11 885 .029381370
F1 545,037,160 0.9227 590,698,125 11 189 .050699956
F1 585,621,110 0.9352 626,198,792 10 62 .026843985
F1 770,991,450 0.9347 824,854,445 7 17 .001242232
L1 268,121,770 1.0646 251,852,123 10 1,132 .036978643
L1 279,018,390 1.1553 241,511,633 9 193 .027196065
L1 237,571,170 1.1979 198,323,040 9 55 .044814064
L1 281,625,980 1.0301 273,396,738 5 11 .003340867
Random Totals: 8,372,467,010   8,750,083,770 185 31,131  
Catg D1 Exception Values: 123,059   42,088      
Total Test Values (4): 8,372,590,069   8,750,125,858      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 437,506,293

Confidence Interval Values (5)

State Lower Limit: 8,312,619,565 (State Test Value minus Margin of Error Percent)
Local Test Value: 8,372,590,069 (Within Confidence Interval)
State Upper Limit: 9,187,632,151 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 8,631,413,498 (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