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2011 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 148,472,412 0.8825 168,240,693 24 1,933 .022323504
A 147,087,159 0.9372 156,943,191 27 920 .018829919
A 148,303,725 0.9795 151,407,580 26 587 .007922850
A 146,962,948 1.0191 144,208,564 15 296 .010724428
B 14,123,280 0.9846 14,344,180 11 45 .000228463
D3 136,495,621 0.9976 136,823,999 35 5,610 .242190067
F1 19,315,035 0.8702 22,196,087 9 129 .052954429
F1 18,744,061 0.8497 22,059,622 8 45 .043088884
F1 20,706,130 0.8442 24,527,517 7 21 .093950691
F1 19,289,242 0.9563 20,170,702 3 4 .025718782
L1 22,005,430 0.9916 22,191,841 9 117 .003902639
L1 44,504,397 0.9931 44,813,611 9 18 .001394494
Random Totals: 886,009,440   927,927,587 183 9,725  
Catg D1 Exception Values: 11,823,332   8,511,287      
Catg B Exception Values: 55,504,276   56,926,957      
Total Test Values (4): 953,337,048   993,365,831      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 49,668,292

Confidence Interval Values (5)

State Lower Limit: 943,697,539 (State Test Value minus Margin of Error Percent)
Local Test Value: 953,337,048 (Within Confidence Interval)
State Upper Limit: 1,043,034,123 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,080,020,935 (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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