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2011 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 499,832,629 1.0179 491,042,960 15 3,996 .004796198
A 461,120,540 0.9909 465,355,273 15 2,761 .019960648
A 463,035,008 1.0040 461,190,247 15 1,972 .003216843
A 492,628,393 0.9965 494,358,648 15 1,386 .008050495
F1 171,914,989 0.7738 222,169,797 9 193 .046544779
F1 147,725,759 0.9332 158,300,213 7 21 .009792234
F1 193,535,822 0.9192 210,548,109 6 15 .013531989
F1 256,576,024 0.9593 267,461,716 4 10 .009368616
G1 198,412,896 1.0320 192,260,558 12 260 .019482220
G1 198,838,041 1.0483 189,676,658 12 120 .004099562
G1 198,994,972 1.0349 192,284,252 9 74 .031263273
G1 194,434,045 1.0162 191,334,427 8 39 .004962388
L1 326,940,929 1.0641 307,246,433 8 79 .005638778
L1 309,617,321 1.0066 307,587,245 6 14 .000124280
L1 444,126,645 1.0079 440,645,545 3 6 .000231952
Random Totals: 4,557,734,013   4,591,462,081 144 10,946  
Catg D1 Exception Values: 1,673,882   1,382,292      
Catg L1 Exception Values: 581,129,214   581,129,214      
Total Test Values (4): 5,140,537,109   5,173,973,587      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 258,698,679

Confidence Interval Values (5)

State Lower Limit: 4,915,274,908 (State Test Value minus Margin of Error Percent)
Local Test Value: 5,140,537,109 (Within Confidence Interval)
State Upper Limit: 5,432,672,266 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,605,654,134 (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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