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2011 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 1,037,844,451 1.0302 1,007,420,356 50 12,934 .033247725
A 957,594,908 0.9459 1,012,363,789 50 8,487 .155226841
A 951,780,707 0.9781 973,091,409 50 6,236 .006526392
A 1,064,863,811 0.9933 1,072,046,523 50 4,378 .007045889
B 99,902,273 1.0557 94,631,309 13 571 .037643419
B 129,629,777 0.8083 160,373,348 7 30 .019195849
B 109,960,708 0.7642 143,889,961 5 12 .001908582
B 145,439,620 0.9235 157,487,407 4 7 .007020494
F1 392,760,646 1.0026 391,742,116 11 948 .006011941
F1 386,281,187 0.8871 435,442,664 10 274 .024603403
F1 365,332,421 0.8740 418,000,482 9 89 .024026001
F1 383,448,343 0.8728 439,331,282 7 24 .011014372
L1 176,863,833 1.0281 172,029,796 10 1,024 .004846290
L1 179,031,360 1.0515 170,262,825 10 190 .004934521
L1 203,810,519 0.9482 214,944,652 8 53 .046164543
L1 192,076,024 1.0164 188,976,804 5 10 .003488401
Random Totals: 6,776,620,588   7,052,034,723 299 35,267  
Catg D1 Exception Values: 47,078   35,919      
Total Test Values (4): 6,776,667,666   7,052,070,642      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 352,603,532

Confidence Interval Values (5)

State Lower Limit: 6,699,467,110 (State Test Value minus Margin of Error Percent)
Local Test Value: 6,776,667,666 (Within Confidence Interval)
State Upper Limit: 7,404,674,174 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 6,861,575,390 (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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