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2007 Confidence Interval Detail
226/Tom Green
226-907/Grape Creek ISD

Category Summary

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

Stratum
Variance
A 20,624,564 1.0588 19,479,188 19 698 .183658311
A 20,428,780 0.9796 20,854,206 8 405 .007029774
A 20,550,057 0.8727 23,547,676 7 294 .023190571
A 20,428,875 0.9417 21,693,613 8 184 .004516221
D3 9,408,765 0.9184 10,244,735 16 1,087 .101341607
Random Totals: 91,441,041   95,819,418 58 2,668  
Catg J Exception Values: 1,912,906   1,950,311      
Catg D1 Exception Values: 5,494,780   5,237,935      
Total Test Values (4): 98,848,727   103,007,664      

Margin of Error

Margin of Error Percent: 5.0175742
Margin of Error Value: 5,168,486

Confidence Interval Values (5)

State Lower Limit: 97,839,178 (State Test Value minus Margin of Error Percent)
Local Test Value: 98,848,727 (Within Confidence Interval)
State Upper Limit: 108,176,150 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 109,811,145 (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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