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2009 Confidence Interval Detail
220/Tarrant
220-907/Keller ISD

Category Summary

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

Stratum
Variance
A 2,126,956,201 1.0115 2,102,774,297 21 16,352 .002270640
A 2,083,125,746 1.0141 2,054,162,061 27 11,115 .006406756
A 2,166,603,288 0.9868 2,195,585,010 25 7,891 .003632293
A 2,236,480,074 0.9989 2,238,942,911 25 4,098 .002927521
B 144,565,670 0.7122 202,984,653 8 122 .016408392
B 184,552,003 0.9562 193,005,650 6 8 .004349365
F1 315,607,376 0.9300 339,362,770 9 342 .008307245
F1 313,272,998 0.9140 342,749,451 7 123 .017834817
F1 268,186,899 0.8876 302,148,377 8 40 .003256027
F1 383,792,984 0.9424 407,250,620 5 14 .026624227
L1 82,492,864 1.0819 76,248,141 7 688 .019927088
L1 84,826,255 1.1071 76,620,229 7 137 .014507571
L1 102,811,565 1.0145 101,342,104 6 38 .014489840
L1 84,446,849 1.1561 73,044,589 3 7 .030994733
Random Totals: 10,577,720,772   10,706,220,863 164 40,975  
Catg D1 Exception Values: 404,250   362,878      
Total Test Values (4): 10,578,125,022   10,706,583,741      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 535,329,187

Confidence Interval Values (5)

State Lower Limit: 10,171,254,554 (State Test Value minus Margin of Error Percent)
Local Test Value: 10,578,125,022 (Within Confidence Interval)
State Upper Limit: 11,241,912,928 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 10,839,061,530 (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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