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2007 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 15,465,821 0.9984 15,490,606 10 275 .008720401
A 15,431,488 0.9754 15,820,677 9 180 .003495756
A 15,501,005 1.0292 15,061,217 10 127 .017355681
A 15,273,579 0.9648 15,830,824 8 73 .019004462
D3 36,567,528 0.8948 40,866,705 21 1,164 .108890835
Random Totals: 98,239,421   103,070,029 58 1,819  
Catg D1 Exception Values: 4,202,160   3,120,830      
Total Test Values (4): 102,441,581   106,190,859      

Margin of Error

Margin of Error Percent: 5.8775709
Margin of Error Value: 6,241,443

Confidence Interval Values (5)

State Lower Limit: 99,949,416 (State Test Value minus Margin of Error Percent)
Local Test Value: 102,441,581 (Within Confidence Interval)
State Upper Limit: 112,432,302 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 114,304,800 (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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