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2008 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 136,919,190 1.0190 134,366,232 19 1,873 .030993063
A 141,396,500 0.9595 147,364,773 33 953 .004012328
A 146,933,280 0.9893 148,522,470 54 614 .009383698
A 157,563,900 1.0249 153,735,877 24 334 .005737939
D3 111,121,040 0.9498 116,994,146 46 4,050 .013758785
F1 18,332,200 0.9396 19,510,643 7 125 .006108373
F1 18,928,560 0.9261 20,439,002 6 46 .038383716
F1 20,154,850 0.9899 20,360,491 5 22 .001033234
F1 15,973,300 0.9824 16,259,467 3 4 .003940393
G1 15,996,263 0.8137 19,658,674 6 52 .033223474
G1 16,348,333 0.6970 23,455,284 5 21 .495889300
G1 18,347,935 1.0180 18,023,512 4 8 .007174309
L1 16,559,304 0.9314 17,778,939 7 159 .049672284
L1 16,932,902 1.0000 16,932,902 9 35 .005165710
L1 17,154,264 0.9233 18,579,296 4 10 .035154242
L1 14,976,384 1.0277 14,572,720 3 5 .000515954
Random Totals: 883,638,205   906,554,428 235 8,311  
Catg D1 Exception Values: 12,897,107   8,985,276      
Catg G1 Exception Values: 12,922,255   13,012,725      
Total Test Values (4): 909,457,567   928,552,429      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 46,427,621

Confidence Interval Values (5)

State Lower Limit: 882,124,808 (State Test Value minus Margin of Error Percent)
Local Test Value: 909,457,567 (Within Confidence Interval)
State Upper Limit: 974,980,050 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,039,881,749 (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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