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2008 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 48,276,514 1.0059 47,993,353 15 1,036 .019382302
A 48,919,897 1.0483 46,665,932 17 540 .008446068
A 51,823,437 0.9896 52,368,065 15 390 .001165074
A 54,648,492 1.0049 54,382,020 19 272 .000962137
D3 44,719,123 1.0134 44,127,810 40 1,532 .008669361
F1 5,394,154 0.9937 5,428,353 6 57 .003042634
F1 4,365,300 0.9406 4,640,974 5 16 .004998494
F1 4,909,730 0.9832 4,993,623 6 5 .017399168
Random Totals: 263,056,647   260,600,130 123 3,848  
Catg D1 Exception Values: 5,340,358   4,872,864      
Total Test Values (4): 268,397,005   265,472,994      

Margin of Error

Margin of Error Percent: 5.0000001
Margin of Error Value: 13,273,650

Confidence Interval Values (5)

State Lower Limit: 252,199,344 (State Test Value minus Margin of Error Percent)
Local Test Value: 268,397,005 (Within Confidence Interval)
State Upper Limit: 278,746,644 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 303,075,813 (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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