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2009 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 17,402,046 0.8948 19,447,973 7 296 .036487421
A 16,341,225 1.0414 15,691,593 11 178 .014919481
A 13,118,889 0.9479 13,839,950 8 108 .006040866
A 15,112,008 1.0011 15,095,403 6 79 .024005153
D3 39,246,687 0.9310 42,155,410 18 1,172 .110425656
Random Totals: 101,220,855   106,230,329 50 1,833  
Catg D1 Exception Values: 3,739,836   2,992,795      
Total Test Values (4): 104,960,691   109,223,124      

Margin of Error

Margin of Error Percent: 6.8730125
Margin of Error Value: 7,506,919

Confidence Interval Values (5)

State Lower Limit: 101,716,205 (State Test Value minus Margin of Error Percent)
Local Test Value: 104,960,691 (Within Confidence Interval)
State Upper Limit: 116,730,043 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 119,703,632 (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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