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2010 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 16,426,782 0.9547 17,206,224 17 289 .018487823
A 16,533,374 0.9950 16,616,456 17 186 .021667961
A 13,645,097 0.9472 14,405,719 17 115 .011955113
A 14,845,890 0.9676 15,343,003 17 77 .006459874
D3 41,624,470 1.1349 36,676,773 20 1,184 .099557621
Random Totals: 103,075,613   100,248,175 88 1,851  
Catg J Exception Values: 3,559,310   3,482,857      
Catg D1 Exception Values: 3,669,963   2,852,085      
Total Test Values (4): 110,304,886   106,583,117      

Margin of Error

Margin of Error Percent: 5.0658802
Margin of Error Value: 5,399,373

Confidence Interval Values (5)

State Lower Limit: 101,183,744 (State Test Value minus Margin of Error Percent)
Local Test Value: 110,304,886 (Within Confidence Interval)
State Upper Limit: 111,982,490 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 122,676,804 (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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