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2009 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 1,073,680,630 0.9753 1,100,872,173 50 11,369 .011507752
A 873,606,860 1.0038 870,299,721 50 7,280 .014233258
A 938,115,440 1.0015 936,710,374 50 5,797 .005492325
A 986,067,290 0.9780 1,008,248,763 49 2,508 .015125195
B 270,163,030 0.9933 271,985,332 9 394 .003456784
B 279,285,310 0.9874 282,849,210 6 47 .002405163
B 359,077,310 0.9587 374,546,062 5 24 .012912188
B 141,516,480 0.9882 143,206,315 4 4 .000105025
C 68,698,540 0.9941 69,106,267 7 1,241 .049856485
C 61,934,370 0.9508 65,139,220 8 140 .010656895
C 60,557,620 0.9044 66,958,890 6 38 .032841240
C 33,858,440 1.0188 33,233,647 4 8 .002200269
F1 719,814,340 0.9300 773,993,914 8 854 .019098384
F1 671,622,210 0.8803 762,946,961 8 158 .027695373
F1 715,698,470 0.8047 889,397,875 7 43 .021660086
F1 522,657,860 0.9444 553,428,484 6 10 .009757785
L1 257,146,070 1.1209 229,410,358 7 1,174 .015810042
L1 288,281,790 1.0425 276,529,295 8 218 .006953569
L1 263,601,990 0.9990 263,865,856 6 70 .035750632
L1 264,410,380 1.0499 251,843,395 6 18 .005550585
Random Totals: 8,849,794,430   9,224,572,112 304 31,395  
Catg D1 Exception Values: 101,772   68,579      
Total Test Values (4): 8,849,896,202   9,224,640,691      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 461,232,035

Confidence Interval Values (5)

State Lower Limit: 8,763,408,656 (State Test Value minus Margin of Error Percent)
Local Test Value: 8,849,896,202 (Within Confidence Interval)
State Upper Limit: 9,685,872,726 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 9,214,152,201 (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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