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2008 Confidence Interval Detail
250/Wood
250-907/Winnsboro ISD

Category Summary

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

Stratum
Variance
A 28,739,740 0.9112 31,540,540 24 727 .068962051
A 31,076,300 0.9536 32,588,402 20 433 .042514888
A 34,553,080 0.8488 40,708,153 16 332 .028348718
A 31,767,000 0.9869 32,188,672 12 187 .018764074
D3 97,001,551 0.8834 109,804,789 28 3,805 .084742713
F1 8,597,530 0.9688 8,874,412 8 128 .158844412
F1 8,802,490 0.9129 9,642,338 7 52 .011618736
F1 8,613,090 1.1770 7,317,833 6 23 .062822874
F1 7,635,840 0.8974 8,508,848 4 7 .026603975
G1 26,001,599 1.0318 25,200,232 15 50 .001888430
Random Totals: 282,788,220   306,374,219 140 5,744  
Catg D1 Exception Values: 10,943,826   7,855,057      
Total Test Values (4): 293,732,046   314,229,276      

Margin of Error

Margin of Error Percent: 5.0000001
Margin of Error Value: 15,711,464

Confidence Interval Values (5)

Local Test Value: 293,732,046 (Outside Confidence Interval)
State Lower Limit: 298,517,812 (State Test Value minus Margin of Error Percent)
State Upper Limit: 329,940,740 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 308,444,386 (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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