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2009 Confidence Interval Detail
220/Tarrant
220-902/Birdville ISD

Category Summary

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

Stratum
Variance
A 1,006,919,358 0.9797 1,027,783,360 18 11,639 .007152945
A 1,046,746,455 0.9894 1,057,960,840 30 9,121 .008516420
A 1,018,468,553 0.9884 1,030,421,442 22 6,724 .004106081
A 1,116,838,832 0.9978 1,119,301,295 30 4,619 .002311864
B 136,751,240 1.0384 131,694,183 7 535 .001887720
B 130,917,354 0.9376 139,630,284 5 22 .006284313
B 157,860,172 0.9909 159,309,892 4 13 .010770115
B 88,130,727 0.9941 88,653,784 3 4 .000843838
F1 426,428,092 0.8697 490,316,307 13 919 .011076473
F1 423,130,233 0.8459 500,213,067 13 265 .011706727
F1 403,949,204 0.9058 445,958,494 11 88 .019259337
F1 411,247,083 0.8971 458,418,329 8 23 .023275410
L1 189,542,895 1.0093 187,796,389 8 1,068 .042453671
L1 200,144,931 1.1615 172,315,911 7 211 .036351488
L1 206,365,347 1.0550 195,606,964 6 56 .006585496
L1 236,200,954 1.0843 217,837,272 5 13 .006664997
Random Totals: 7,199,641,430   7,423,217,813 190 35,320  
Catg D1 Exception Values: 41,130   40,794      
Total Test Values (4): 7,199,682,560   7,423,258,607      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 371,162,930

Confidence Interval Values (5)

State Lower Limit: 7,052,095,677 (State Test Value minus Margin of Error Percent)
Local Test Value: 7,199,682,560 (Within Confidence Interval)
State Upper Limit: 7,794,421,537 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 7,366,103,594 (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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