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2009 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 51,569,233 0.9511 54,220,621 9 1,062 .024305741
A 51,808,417 0.9666 53,598,611 10 549 .035211295
A 48,700,874 0.9864 49,372,338 7 356 .005383064
A 49,166,680 0.9705 50,661,185 8 242 .004745773
D3 44,230,510 0.9602 46,063,851 11 1,503 .037850228
Random Totals: 245,475,714   253,916,606 45 3,712  
Catg D1 Exception Values: 5,864,417   5,650,232      
Total Test Values (4): 251,340,131   259,566,838      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 12,978,342

Confidence Interval Values (5)

State Lower Limit: 246,588,496 (State Test Value minus Margin of Error Percent)
Local Test Value: 251,340,131 (Within Confidence Interval)
State Upper Limit: 272,545,180 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 304,892,563 (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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