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2008 Confidence Interval Detail
091/Grayson
091-902/Collinsville ISD

Category Summary

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

Stratum
Variance
A 15,567,088 0.9289 16,758,626 7 276 .043201424
A 12,709,027 1.0004 12,703,945 8 146 .003084089
A 22,007,001 1.0148 21,686,047 7 190 .015558358
A 16,035,178 1.0432 15,371,145 7 81 .000672522
D3 38,586,523 0.9794 39,398,124 14 1,147 .012688109
Random Totals: 104,904,817   105,917,887 43 1,840  
Catg D1 Exception Values: 4,116,166   3,098,444      
Total Test Values (4): 109,020,983   109,016,331      

Margin of Error

Margin of Error Percent: 5.0000004
Margin of Error Value: 5,450,817

Confidence Interval Values (5)

State Lower Limit: 103,565,514 (State Test Value minus Margin of Error Percent)
Local Test Value: 109,020,983 (Within Confidence Interval)
State Upper Limit: 114,467,148 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 120,092,213 (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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