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2008 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 963,200,510 1.0321 933,243,397 37 10,181 .007168437
A 971,250,110 0.9988 972,417,010 46 8,188 .001490470
A 1,032,734,490 0.9935 1,039,491,183 43 6,567 .002317249
A 1,033,628,930 1.0041 1,029,408,356 45 2,696 .004048082
B 290,958,840 1.0476 277,738,488 17 456 .017209402
B 277,179,500 0.9539 290,575,008 6 45 .008048109
B 258,185,620 0.9277 278,307,233 5 24 .007699916
B 312,602,540 1.0222 305,813,481 4 9 .000217896
F1 706,386,100 0.8413 839,636,396 15 879 .045813620
F1 760,616,370 0.9082 837,498,756 11 178 .021317851
F1 635,575,980 0.9150 694,618,557 7 39 .008486385
F1 804,290,960 0.9242 870,256,395 5 15 .001461257
L1 269,749,320 1.0634 253,666,842 7 1,225 .065975966
L1 263,923,940 1.0300 256,236,835 7 204 .079496893
L1 296,872,160 1.0742 276,365,816 6 79 .002655076
L1 247,750,910 1.1150 222,198,126 5 16 .012174616
Random Totals: 9,124,906,280   9,377,471,879 266 30,801  
Catg D1 Exception Values: 83,860   61,052      
Total Test Values (4): 9,124,990,140   9,377,532,931      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 468,876,647

Confidence Interval Values (5)

State Lower Limit: 8,908,656,284 (State Test Value minus Margin of Error Percent)
Local Test Value: 9,124,990,140 (Within Confidence Interval)
State Upper Limit: 9,846,409,578 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 9,504,743,537 (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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