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2009 Confidence Interval Detail
220/Tarrant
220-919/Carroll ISD

Category Summary

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

Stratum
Variance
A 912,632,809 0.9766 934,500,112 18 2,709 .002114379
A 980,796,325 0.9865 994,218,272 24 2,124 .001068848
A 1,032,302,113 1.0055 1,026,655,508 30 1,704 .004150525
A 1,088,093,093 0.9992 1,088,964,264 27 1,035 .001334992
F1 238,687,660 0.8975 265,947,253 8 157 .049802421
F1 261,346,518 0.8913 293,219,475 6 47 .004785517
F1 219,679,153 0.9198 238,833,608 4 12 .006000285
L1 67,165,504 0.9775 68,711,513 7 377 .011594330
L1 68,243,986 1.1038 61,826,405 7 56 .003193634
L1 47,092,702 1.0693 44,040,683 4 9 .004817978
L1 56,961,339 1.0468 54,414,730 3 5 .001073694
Random Totals: 4,973,001,202   5,071,331,823 138 8,235  
Catg D1 Exception Values: 170,703   118,645      
Catg F1 Exception Values: 202,040,655   206,871,225      
Total Test Values (4): 5,175,212,560   5,278,321,693      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 263,916,085

Confidence Interval Values (5)

State Lower Limit: 5,014,405,608 (State Test Value minus Margin of Error Percent)
Local Test Value: 5,175,212,560 (Within Confidence Interval)
State Upper Limit: 5,542,237,778 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,378,979,309 (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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