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2006 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 736,018,486 0.9933 740,983,073 48 4,034 .001216315
A 735,765,310 0.9696 758,833,859 47 2,850 .007105422
A 735,805,058 0.9862 746,101,255 50 2,227 .001111319
A 735,847,330 0.9753 754,483,062 49 1,450 .001143403
F1 458,032,189 0.8028 570,543,335 12 151 .085321070
F1 465,066,596 0.9027 515,195,077 11 61 .008193600
F1 467,671,747 0.9066 515,852,357 10 35 .004843572
F1 440,558,451 0.9662 455,970,245 8 17 .003609465
L1 367,584,944 1.0194 360,589,508 7 276 .012313854
L1 365,412,391 1.0497 348,111,261 6 61 .011903057
L1 371,083,541 1.0808 343,341,544 7 24 .008498542
Random Totals: 5,878,846,043   6,110,004,576 255 11,186  
Catg D1 Exception Values: 171,137   166,889      
Catg L1 Exception Values: 308,304,595   298,386,453      
Total Test Values (4): 6,187,321,775   6,408,557,918      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 320,427,896

Confidence Interval Values (5)

State Lower Limit: 6,088,130,022 (State Test Value minus Margin of Error Percent)
Local Test Value: 6,187,321,775 (Within Confidence Interval)
State Upper Limit: 6,728,985,814 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 6,499,340,850 (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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