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2007 Confidence Interval Detail
070/Ellis
070-905/Ferris ISD

Category Summary

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

Stratum
Variance
A 48,956,018 0.8870 55,192,805 9 3,370 .033667681
A 48,853,165 0.9018 54,172,949 9 1,925 .059757324
A 48,931,475 0.8497 57,586,766 9 1,311 .061136833
A 48,865,220 0.9795 49,887,922 8 790 .006601126
D3 42,665,120 0.9132 46,720,456 21 1,603 .061656552
F1 4,977,629 0.9205 5,407,527 9 52 .016989295
F1 5,024,689 0.8647 5,810,904 9 18 .069010496
F1 5,544,307 0.8938 6,203,073 2 7 .082407856
Random Totals: 253,817,623   280,982,402 76 9,076  
Catg D1 Exception Values: 4,981,400   5,408,395      
Catg F1 Exception Values: 6,096,100   6,096,100      
Total Test Values (4): 264,895,123   292,486,897      

Margin of Error

Margin of Error Percent: 5.4053156
Margin of Error Value: 15,809,840

Confidence Interval Values (5)

Local Test Value: 264,895,123 (Outside Confidence Interval)
State Lower Limit: 276,677,057 (State Test Value minus Margin of Error Percent)
State Upper Limit: 308,296,737 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 298,261,099 (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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