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2007 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 772,903,301 0.9895 781,104,902 50 4,123 .000839845
A 773,345,022 0.9924 779,267,455 50 2,858 .000857245
A 772,542,524 0.9941 777,127,577 50 2,241 .000563645
A 772,594,786 0.9828 786,115,981 50 1,444 .001209350
F1 568,887,556 0.7100 801,250,079 7 156 .026930853
F1 573,998,771 0.7907 725,937,487 6 65 .027854063
F1 564,487,092 0.9630 586,175,589 6 36 .031276774
F1 549,498,145 0.9908 554,600,469 5 18 .018772743
L1 385,903,115 1.1105 347,503,931 7 272 .014485311
L1 390,610,569 1.1049 353,525,721 7 60 .006139652
L1 399,007,048 1.0616 375,854,416 6 22 .010482772
L1 357,401,190 0.9944 359,413,908 5 7 .007526086
Random Totals: 6,881,179,119   7,227,877,515 249 11,302  
Catg D1 Exception Values: 177,418   150,173      
Total Test Values (4): 6,881,356,537   7,228,027,688      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 361,401,384

Confidence Interval Values (5)

State Lower Limit: 6,866,626,304 (State Test Value minus Margin of Error Percent)
Local Test Value: 6,881,356,537 (Within Confidence Interval)
State Upper Limit: 7,589,429,072 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 7,280,278,249 (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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