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2009 Confidence Interval Detail
090/Gray
033-901/Groom ISD

Category Summary

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

Stratum
Variance
D3 1,684,406 0.6367 2,645,525 9 186 .341641087
G1 2,295,199 1.0391 2,208,834 15 21 .009843300
Random Totals: 3,979,605   4,854,359 24 207  
Catg J Exception Values: 684,799   614,635      
Catg D1 Exception Values: 1,874,530   2,975,342      
Catg G1 Exception Values: 1,148,243   920,604      
Total Test Values (4): 7,687,177   9,364,940      

Margin of Error

Margin of Error Percent: 11.1342091
Margin of Error Value: 1,042,712

Confidence Interval Values (5)

Local Test Value: 7,687,177 (Outside Confidence Interval)
State Lower Limit: 8,322,228 (State Test Value minus Margin of Error Percent)
State Upper Limit: 10,407,652 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 9,112,424 (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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