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2009 Confidence Interval Detail
072/Erath
072-910/Morgan Mill ISD

Category Summary

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

Stratum
Variance
A 1,423,290 0.9456 1,505,171 6 36 .007255152
A 1,364,720 0.9505 1,435,792 5 22 .004226220
A 1,590,060 1.0473 1,518,247 6 20 .018242747
A 1,833,030 1.0028 1,827,912 4 13 .010007741
D3 44,318,500 1.0123 43,780,006 27 1,038 .048821414
G1 5,162,120 1.0986 4,698,817 6 34 .006793002
G1 5,211,520 1.0184 5,117,361 5 15 .005439989
G1 5,126,360 0.9896 5,180,234 4 10 .014666258
G1 4,580,320 1.0369 4,417,321 3 5 .094826004
Random Totals: 70,609,920   69,480,861 66 1,193  
Catg J Exception Values: 942,308   1,018,804      
Catg D1 Exception Values: 4,406,310   4,011,152      
Total Test Values (4): 75,958,538   74,510,817      

Margin of Error

Margin of Error Percent: 5.1874589
Margin of Error Value: 3,865,218

Confidence Interval Values (5)

State Lower Limit: 70,645,599 (State Test Value minus Margin of Error Percent)
Local Test Value: 75,958,538 (Within Confidence Interval)
State Upper Limit: 78,376,035 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 79,013,406 (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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