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2009 Confidence Interval Detail
212/Smith
212-909/Chapel Hill ISD

Category Summary

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

Stratum
Variance
A 143,233,250 0.9237 155,064,686 23 1,905 .012966760
A 147,737,006 0.9780 151,060,333 29 950 .011212342
A 147,996,748 1.0078 146,851,308 36 594 .007774064
A 149,219,627 1.0294 144,957,866 19 302 .005956221
D3 115,066,667 0.8855 129,945,417 35 5,335 .093436975
F1 19,066,679 0.9860 19,337,403 7 128 .028578628
F1 18,484,622 1.0598 17,441,614 6 45 .054399351
F1 18,858,571 0.9508 19,834,425 5 21 .006200464
F1 21,045,728 0.9904 21,249,725 3 6 .000189414
G1 11,190,496 1.0535 10,622,208 7 44 .006451323
G1 11,427,087 0.9727 11,747,802 5 19 .006965586
G1 11,817,518 1.0330 11,439,998 4 10 .007174255
L1 10,869,681 0.9667 11,244,110 9 155 .009750682
L1 18,253,406 0.9592 19,029,823 7 50 .008039861
L1 35,314,604 1.0130 34,861,406 3 21 .000238281
Random Totals: 879,581,690   904,688,124 198 9,585  
Catg D1 Exception Values: 12,316,829   9,740,353      
Catg G1 Exception Values: 10,056,654   10,202,735      
Catg L1 Exception Values: 8,110,560   8,110,560      
Total Test Values (4): 910,065,733   932,741,772      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 46,637,089

Confidence Interval Values (5)

State Lower Limit: 886,104,683 (State Test Value minus Margin of Error Percent)
Local Test Value: 910,065,733 (Within Confidence Interval)
State Upper Limit: 979,378,861 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,060,813,638 (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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