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2008 Confidence Interval Detail
057/Dallas
057-922/Coppell ISD

Category Summary

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

Stratum
Variance
A 781,534,320 0.9842 794,080,797 33 4,162 .000967460
A 770,435,820 0.9814 785,037,518 34 2,882 .000791046
A 840,198,440 0.9762 860,682,688 34 2,466 .001074427
A 859,548,930 0.9864 871,399,970 34 1,643 .000748732
F1 567,718,060 0.9357 606,730,854 10 165 .008203145
F1 640,172,140 0.9148 699,794,644 7 77 .022232615
F1 527,577,270 0.9053 582,765,128 7 34 .029578107
F1 686,696,340 0.8722 787,315,226 6 24 .032333192
L1 419,127,320 1.0145 413,136,836 7 297 .000635657
L1 409,131,580 1.0247 399,269,620 6 67 .024204133
L1 419,609,460 1.0323 406,480,151 5 24 .002960281
L1 345,076,150 0.9873 349,514,990 4 9 .010445523
Random Totals: 7,266,825,830   7,556,208,422 187 11,850  
Catg D1 Exception Values: 181,183   152,386      
Total Test Values (4): 7,267,007,013   7,556,360,808      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 377,818,040

Confidence Interval Values (5)

State Lower Limit: 7,178,542,768 (State Test Value minus Margin of Error Percent)
Local Test Value: 7,267,007,013 (Within Confidence Interval)
State Upper Limit: 7,934,178,848 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 7,603,211,387 (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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