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2011 Confidence Interval Detail
220/Tarrant
220-901/Arlington ISD

Category Summary

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

Stratum
Variance
A 2,410,444,978 0.9965 2,418,911,167 75 27,374 .011278549
A 2,360,450,684 0.9914 2,380,926,653 75 19,232 .008093757
A 2,419,647,589 0.9929 2,436,949,934 75 14,774 .014010138
A 2,384,461,616 0.9647 2,471,713,088 75 8,300 .012349130
B 412,947,376 0.8687 475,362,468 27 2,392 .208908101
B 382,592,650 0.9069 421,868,618 9 89 .048097871
B 412,062,733 0.9588 429,769,225 8 50 .007126822
B 541,106,554 0.8784 616,013,837 7 24 .008077749
F1 1,151,544,236 0.9938 1,158,728,352 10 1,718 .018691245
F1 1,128,037,932 0.8551 1,319,188,319 10 511 .040975959
F1 1,112,185,305 0.8734 1,273,397,418 10 200 .032761738
F1 1,155,658,306 0.8650 1,336,021,163 9 62 .017658424
L1 572,450,825 1.0306 555,453,935 10 2,315 .004255857
L1 563,635,482 1.0053 560,663,963 10 368 .002849578
L1 560,011,292 1.0259 545,873,177 9 109 .003679720
L1 670,841,270 1.0078 665,649,206 7 29 .000766679
Random Totals: 18,238,078,828   19,066,490,523 426 77,547  
Catg J Exception Values: 76,290,135   70,450,761      
Catg D1 Exception Values: 99,547   115,442      
Total Test Values (4): 18,314,468,510   19,137,056,726      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 956,852,836

Confidence Interval Values (5)

State Lower Limit: 18,180,203,890 (State Test Value minus Margin of Error Percent)
Local Test Value: 18,314,468,510 (Within Confidence Interval)
State Upper Limit: 20,093,909,562 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 18,937,808,260 (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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