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2009 Confidence Interval Detail
014/Bell
014-910/Troy ISD

Category Summary

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

Stratum
Variance
A 26,748,226 0.8799 30,399,166 8 433 .042643498
A 26,433,737 0.9095 29,064,032 8 279 .012751456
A 26,900,488 0.9996 26,911,253 7 211 .055332738
A 25,288,897 0.9635 26,246,909 7 140 .023180961
D3 81,537,780 0.9841 82,855,177 22 2,306 .103700145
Random Totals: 186,909,128   195,476,537 52 3,369  
Catg J Exception Values: 21,966,606   21,870,010      
Catg D1 Exception Values: 9,822,275   8,578,015      
Total Test Values (4): 218,698,009   225,924,562      

Margin of Error

Margin of Error Percent: 6.0276018
Margin of Error Value: 13,617,833

Confidence Interval Values (5)

State Lower Limit: 212,306,729 (State Test Value minus Margin of Error Percent)
Local Test Value: 218,698,009 (Within Confidence Interval)
State Upper Limit: 239,542,395 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 228,175,589 (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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