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2009 Confidence Interval Detail
220/Tarrant
061-911/Northwest ISD

Category Summary

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

Stratum
Variance
A 450,649,330 1.0167 443,247,103 24 3,276 .003190557
A 407,039,408 1.0047 405,135,272 22 2,269 .004152648
A 498,684,018 1.0113 493,111,854 24 1,978 .006283695
A 396,728,428 1.0044 394,990,470 23 1,025 .005266479
F1 174,695,491 0.8582 203,560,348 8 185 .012274728
F1 127,568,404 0.8665 147,222,624 6 18 .003852168
F1 170,471,279 0.8622 197,716,631 5 14 .005555691
F1 230,896,319 0.8576 269,235,447 5 12 .010035400
G1 228,132,062 1.0510 217,061,905 9 247 .002112670
G1 230,425,755 0.9709 237,332,120 8 112 .004807367
G1 227,491,525 1.0196 223,118,404 9 68 .000854346
G1 226,190,713 0.9982 226,598,590 6 40 .000686961
L1 271,057,251 0.9890 274,072,043 6 78 .011280025
L1 186,258,244 1.0083 184,725,026 5 13 .025247255
L1 484,170,599 0.9751 496,534,303 4 15 .034110694
L1 290,097,098 1.0005 289,952,122 2 3 .000000374
Random Totals: 4,600,555,924   4,703,614,262 166 9,353  
Catg D1 Exception Values: 1,577,682   1,789,473      
Catg L1 Exception Values: 289,962,858   289,962,858      
Total Test Values (4): 4,892,096,464   4,995,366,593      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 249,768,330

Confidence Interval Values (5)

State Lower Limit: 4,745,598,263 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,892,096,464 (Within Confidence Interval)
State Upper Limit: 5,245,134,923 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,512,055,597 (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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