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2011 Confidence Interval Detail
220/Tarrant
220-905/Fort Worth ISD

Category Summary

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

Stratum
Variance
A 3,422,364,906 0.9712 3,523,851,839 100 53,009 .045120539
A 3,357,417,680 1.0031 3,347,041,850 100 26,542 .013487529
A 3,505,479,963 0.9845 3,560,670,353 100 13,671 .009670100
A 3,470,675,596 0.9439 3,676,952,639 100 4,752 .051095581
B 382,036,986 1.0127 377,245,962 44 3,659 .010312364
B 377,369,901 0.8406 448,929,218 10 371 .030210999
B 382,056,890 0.8238 463,773,841 9 73 .022575907
B 547,567,345 0.8724 627,656,287 7 27 .012323111
C 110,789,767 0.8692 127,461,766 14 6,682 .219400947
C 108,895,248 0.8896 122,409,227 10 1,152 .075549762
C 114,801,007 0.7684 149,402,664 10 361 .096390788
C 110,673,137 0.9103 121,578,751 11 89 .018805625
F1 1,477,053,194 0.9656 1,529,673,979 12 3,990 .055281369
F1 1,448,349,582 0.9453 1,532,158,661 10 804 .025223083
F1 1,499,140,855 0.8898 1,684,806,535 10 208 .007683485
F1 1,539,210,059 0.8811 1,746,918,691 8 42 .002005121
G1 212,188,361 0.9437 224,847,262 12 190 .014346441
G1 211,740,059 0.9947 212,868,261 10 88 .003020281
G1 211,384,397 1.0062 210,081,889 8 54 .005184300
G1 209,455,844 0.9998 209,497,744 8 34 .003756651
L1 732,841,916 0.9920 738,751,931 10 3,321 .002895076
L1 721,610,391 1.0928 660,331,617 10 460 .015877901
L1 749,074,248 1.0094 742,098,522 9 121 .002515320
L1 793,263,331 1.0297 770,382,957 7 28 .002573938
Random Totals: 25,695,440,663   26,809,392,446 629 119,728  
Catg J Exception Values: 239,976,946   239,179,033      
Catg D1 Exception Values: 1,493,360   948,011      
Total Test Values (4): 25,936,910,969   27,049,519,490      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 1,352,475,975

Confidence Interval Values (5)

State Lower Limit: 25,697,043,515 (State Test Value minus Margin of Error Percent)
Local Test Value: 25,936,910,969 (Within Confidence Interval)
State Upper Limit: 28,401,995,465 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 25,175,148,246 (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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