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2009 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 3,216,348,816 1.0118 3,178,838,521 44 47,413 .031879181
A 3,345,916,447 1.0183 3,285,786,553 51 27,556 .006842509
A 3,528,373,433 0.9924 3,555,394,431 54 15,501 .002828819
A 3,880,963,517 1.0081 3,849,780,297 47 5,923 .003499051
B 464,250,736 1.0311 450,248,023 12 3,743 .011759273
B 486,320,051 0.9903 491,083,562 8 296 .000674284
B 399,781,297 0.9383 426,069,804 6 57 .011908183
B 374,450,141 0.9581 390,825,739 5 18 .005819627
C 120,213,591 0.9512 126,380,983 7 6,973 .014869551
C 113,028,371 0.8796 128,499,740 8 1,093 .013425748
C 109,406,223 1.0991 99,541,646 7 324 .010808160
C 108,627,938 0.9823 110,585,298 6 92 .001399518
F1 1,568,794,717 0.8673 1,808,825,916 8 3,994 .018871110
F1 1,547,787,559 0.8893 1,740,456,043 9 784 .003850580
F1 1,452,016,936 0.9678 1,500,327,481 7 194 .007489118
F1 1,706,619,573 0.9072 1,881,194,415 6 45 .014184893
G1 163,865,365 1.0079 162,580,975 7 104 .003345111
G1 162,467,435 0.9757 166,513,718 6 49 .002349294
G1 165,324,918 0.9968 165,855,656 6 32 .000534835
G1 158,582,251 1.0140 156,392,752 5 21 .000065653
L1 821,419,102 1.1422 719,155,229 7 3,242 .069644397
L1 788,084,651 1.0839 727,082,435 7 430 .002854804
L1 811,780,717 1.0467 775,561,973 7 123 .007516333
L1 737,808,099 1.0528 700,805,565 5 25 .004270849
Random Totals: 26,232,231,884   26,597,786,755 335 118,032  
Catg D1 Exception Values: 1,349,504   1,209,434      
Total Test Values (4): 26,233,581,388   26,598,996,189      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 1,329,949,809

Confidence Interval Values (5)

State Lower Limit: 25,269,046,380 (State Test Value minus Margin of Error Percent)
Local Test Value: 26,233,581,388 (Within Confidence Interval)
State Upper Limit: 27,928,945,998 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 25,491,845,650 (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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