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2010 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 51,963,099 0.9975 52,093,332 10 1,074 .012532245
A 56,342,519 1.0721 52,553,418 14 599 .006718205
A 45,808,860 0.9862 46,449,868 10 343 .004472693
A 41,438,290 0.9586 43,227,926 10 205 .000581944
D3 42,064,920 1.0768 39,064,747 21 1,430 .117584292
Random Totals: 237,617,688   233,389,291 65 3,651  
Catg J Exception Values: 11,069,053   10,696,461      
Catg D1 Exception Values: 6,282,993   6,245,874      
Total Test Values (4): 254,969,734   250,331,626      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 12,516,581

Confidence Interval Values (5)

State Lower Limit: 237,815,045 (State Test Value minus Margin of Error Percent)
Local Test Value: 254,969,734 (Within Confidence Interval)
State Upper Limit: 262,848,207 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 298,443,557 (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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