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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 772,750,403 0.9895 780,950,382 50 4,123 .000839845
A 773,192,037 0.9924 779,113,298 50 2,858 .000857245
A 772,389,698 0.9941 776,973,844 50 2,241 .000563645
A 772,441,949 0.9828 785,960,469 50 1,444 .001209350
F1 566,126,209 0.7100 797,360,858 7 156 .026930853
F1 571,212,615 0.7907 722,413,830 6 65 .027854063
F1 561,747,104 0.9630 583,330,326 6 36 .031276774
F1 546,830,913 0.9908 551,908,471 5 18 .018772743
L1 384,410,570 1.1105 346,159,901 7 272 .014485311
L1 389,099,817 1.1049 352,158,401 7 60 .006139652
L1 397,463,821 1.0616 374,400,736 6 22 .010482772
L1 356,018,880 0.9944 358,023,813 5 7 .007526086
Random Totals: 6,863,684,016   7,208,754,329 249 11,302  
Catg D1 Exception Values: 177,418   149,912      
Total Test Values (4): 6,863,861,434   7,208,904,241      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 360,445,212

Confidence Interval Values (5)

State Lower Limit: 6,848,459,029 (State Test Value minus Margin of Error Percent)
Local Test Value: 6,863,861,434 (Within Confidence Interval)
State Upper Limit: 7,569,349,453 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 7,130,941,583 (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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