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2009 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 825,439,300 0.9731 848,257,425 49 4,307 .004062780
A 825,716,850 0.9557 863,991,681 50 3,014 .006266828
A 829,118,380 0.9516 871,288,756 50 2,384 .004961883
A 830,564,150 0.9664 859,441,380 50 1,551 .003094791
F1 659,274,730 0.9336 706,164,021 9 187 .004055390
F1 581,700,360 0.9010 645,616,382 8 65 .002564233
F1 597,196,080 0.8991 664,215,415 7 38 .005846712
F1 399,193,120 0.9088 439,252,993 6 12 .002378629
L1 348,384,180 1.0650 327,121,296 7 269 .009083363
L1 430,089,160 1.0424 412,595,127 6 77 .003522693
L1 411,238,060 0.9649 426,197,596 5 25 .012804739
L1 401,898,730 0.9760 411,781,486 4 11 .029983209
Random Totals: 7,139,813,100   7,475,923,558 251 11,940  
Catg D1 Exception Values: 215,188   168,564      
Total Test Values (4): 7,140,028,288   7,476,092,122      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 373,804,606

Confidence Interval Values (5)

State Lower Limit: 7,102,287,516 (State Test Value minus Margin of Error Percent)
Local Test Value: 7,140,028,288 (Within Confidence Interval)
State Upper Limit: 7,849,896,728 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 7,486,564,726 (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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